Locking device of electric tool output shaft

The utility model relates to a locking device for the output shaft of electric tools, which comprises a stopper block, a dynamic force output disc, a stopper ring and a plurality of lock pins, wherein the stopper block comprises a plurality of first joint parts and at least one bridging part, the dynamic force output disc comprises a plurality of insertion parts formed with intervals, the stopper ring is sheathed on the outside of the insertion parts and the lock pins are respectively inserted in the dynamic force output disc arranged between the stopper block and the stopper ring. When the utility model is in use, the first joint parts of the stopper block are sheathed in the dynamic force output disc through the inner side of the insertion parts, the bridging parts of the stopper block are arranged on the top surfaces of the insertion parts and the stopper block deep penetrate into the disc surface of the dynamic force output disc. The thickness of the dynamic force output disc is reduced, and simultaneously the thickness of the stopper block is enlarged. In the moment, the output shaft is locked and the structure is strengthened. The utility model shortens the integral length of the locking device for the output shaft of electric tools.