The utility model discloses a device which is capable of automatically printing on a qualified product after the detection. The device includes an automatic printer, an electrical controller which is electrically connected with the automatic printer, and a conduction tester which is electrically connected with the electrical controller. The device which is capable of automatically printing on the qualified product after the detection can standardize the operation, reduce the procedures, and solve the problems of wrong marking, neglected marking, and the like in the artificial operation, so the operation efficiency is increased, and the product quality requirements can also be satisfied.