diff --git a/app/code/Magento/CatalogImportExport/Model/Import/Product.php b/app/code/Magento/CatalogImportExport/Model/Import/Product.php
index 097db293ab77c..6c3bef2a52b0c 100644
--- a/app/code/Magento/CatalogImportExport/Model/Import/Product.php
+++ b/app/code/Magento/CatalogImportExport/Model/Import/Product.php
@@ -294,7 +294,8 @@ class Product extends \Magento\ImportExport\Model\Import\Entity\AbstractEntity
         ValidatorInterface::ERROR_MEDIA_PATH_NOT_ACCESSIBLE => 'Imported resource (image) does not exist in the local media storage',
         ValidatorInterface::ERROR_MEDIA_URL_NOT_ACCESSIBLE => 'Imported resource (image) could not be downloaded from external resource due to timeout or access permissions',
         ValidatorInterface::ERROR_INVALID_WEIGHT => 'Product weight is invalid',
-        ValidatorInterface::ERROR_DUPLICATE_URL_KEY => 'Url key: \'%s\' was already generated for an item with the SKU: \'%s\'. You need to specify the unique URL key manually'
+        ValidatorInterface::ERROR_DUPLICATE_URL_KEY => 'Url key: \'%s\' was already generated for an item with the SKU: \'%s\'. You need to specify the unique URL key manually',
+        ValidatorInterface::ERROR_DUPLICATE_MULTISELECT_VALUES => "Value for multiselect attribute %s contains duplicated values",
     ];
     //@codingStandardsIgnoreEnd
 
diff --git a/app/code/Magento/CatalogImportExport/Model/Import/Product/RowValidatorInterface.php b/app/code/Magento/CatalogImportExport/Model/Import/Product/RowValidatorInterface.php
index 17f7fae28ba75..f41596ad185a6 100644
--- a/app/code/Magento/CatalogImportExport/Model/Import/Product/RowValidatorInterface.php
+++ b/app/code/Magento/CatalogImportExport/Model/Import/Product/RowValidatorInterface.php
@@ -85,6 +85,8 @@ interface RowValidatorInterface extends \Magento\Framework\Validator\ValidatorIn
 
     const ERROR_DUPLICATE_URL_KEY = 'duplicatedUrlKey';
 
+    const ERROR_DUPLICATE_MULTISELECT_VALUES = 'duplicatedMultiselectValues';
+
     /**
      * Value that means all entities (e.g. websites, groups etc.)
      */
diff --git a/app/code/Magento/CatalogImportExport/Model/Import/Product/Validator.php b/app/code/Magento/CatalogImportExport/Model/Import/Product/Validator.php
index e1a6188551c0c..2aa2105991883 100644
--- a/app/code/Magento/CatalogImportExport/Model/Import/Product/Validator.php
+++ b/app/code/Magento/CatalogImportExport/Model/Import/Product/Validator.php
@@ -219,6 +219,12 @@ public function isAttributeValid($attrCode, array $attrParams, array $rowData)
                         break;
                     }
                 }
+
+                $uniqueValues = array_unique($values);
+                if (count($uniqueValues) != count($values)) {
+                    $valid = false;
+                    $this->_addMessages([RowValidatorInterface::ERROR_DUPLICATE_MULTISELECT_VALUES]);
+                }
                 break;
             case 'datetime':
                 $val = trim($rowData[$attrCode]);
diff --git a/app/code/Magento/CatalogImportExport/Test/Unit/Model/Import/Product/ValidatorTest.php b/app/code/Magento/CatalogImportExport/Test/Unit/Model/Import/Product/ValidatorTest.php
index 1179783fdd3f9..64b925955519e 100644
--- a/app/code/Magento/CatalogImportExport/Test/Unit/Model/Import/Product/ValidatorTest.php
+++ b/app/code/Magento/CatalogImportExport/Test/Unit/Model/Import/Product/ValidatorTest.php
@@ -167,6 +167,26 @@ public function attributeValidationProvider()
                 ['product_type' => 'any', 'attribute_code' => 'Option 1|Option 2'],
                 true
             ],
+            [
+                Import::BEHAVIOR_APPEND,
+                ['is_required' => true, 'type' => 'multiselect',
+                    'options' => ['option 1' => 0, 'option 2' => 1, 'option 3']],
+                ['product_type' => 'any', 'attribute_code' => 'Option 1|Option 2|Option 1'],
+                false
+            ],
+            [
+                Import::BEHAVIOR_APPEND,
+                ['is_required' => true, 'type' => 'multiselect',
+                    'options' => ['option 1' => 0, 'option 2' => 1, 'option 3']],
+                ['product_type' => 'any', 'attribute_code' => 'Option 3|Option 3|Option 3|Option 1'],
+                false
+            ],
+            [
+                Import::BEHAVIOR_APPEND,
+                ['is_required' => true, 'type' => 'multiselect', 'options' => ['option 1' => 0]],
+                ['product_type' => 'any', 'attribute_code' => 'Option 1|Option 1|Option 1|Option 1'],
+                false
+            ],
             [
                 Import::BEHAVIOR_APPEND,
                 ['is_required' => true, 'type' => 'datetime'],