Self-tightening chuck with lock

The self-tightening chuck with the lock comprises a chuck connector, a clamping jaw, a clamping jaw support, a conical sleeve and a self-locking structure, the self-locking structure comprises an elastic piece and a gear ring, the elastic piece is installed at the rear end of the clamping jaw support, the gear ring is arranged on the chuck connector, the self-locking structure further comprises an operation ring, and the operation ring is arranged on the chuck connector. The operation ring is provided with a self-locking control cam surface matched with the elastic sheet, the elastic sheet is provided with an outward positioning bulge, the operation ring is provided with a first groove and a second groove which are connected with the positioning bulge, and the positions of the first groove and the second groove are matched with the position of the self-locking control cam surface. When the self-locking structure is in a self-locking state and a non-self-locking state, the self-locking structure is connected w