The invention discloses a locking device used for lift manual falling prevention. The locking device comprises a crank, a connecting rod, a locking sliding block, a joystick and stop dogs, wherein the locking sliding block is arranged on a lift car frame and can slide horizontally; one end of the connecting rod is connected with the locking sliding block, the connecting rod can swing with the connecting point as the fulcrum, the other end of the connecting rod is connected with one end of the crank, and the connecting rod and the crank can swing with the connecting point as the fulcrum; the other end of the crank is connected with the lift car frame, and the crank can swing with the connecting point as the fulcrum; one end of the joystick is connected with the crank, the joystick and the crank can swing with the connecting point as the fulcrum, and the other end of the joystick is arranged in the lift car; and the stop dogs are arranged on a shaft wall and are matched with the locking sliding block in shape. When an existing anti-falling device fails, a person in the lift can manually brake a lift to achieve the purpose of falling prevention, and self rescue of the person in the lift is achieved.