The invention discloses a full-automatic screw detection and classification device which comprises a first conveying belt capable of being used for conveying products. The device is characterized in that closing units capable of closing the first conveying belt and preventing the products from moving forwards are arranged on the first conveying belt at intervals; a fixing shell capable of being used for fixing the products is arranged at the front end of the first conveying belt; a moving unit is arranged on one side of the first conveying belt and can drive the closing unit close to the fixing shell end to move forwards so as to fix the products accurately to the fixing shell; a detecting unit is arranged above the fixing shell and detects whether screws are driven into the products or not; a lifting unit capable of driving the fixing shell to move up and down so as to be tightly attached to the detecting unit for detection is arranged under the fixing shell; a third conveying belt and a second conveying belt are arranged on the two sides below the fixing shell correspondingly; and a rotating unit is arranged on the lifting unit and can drive the fixing shell to rotate so as to make the products in the fixing shell to fall onto the third conveying belt and the second conveying belt.