The utility model relates to the field of trigger switches, in particular to a reversing speed regulation trigger switch with a brake function. The speed regulation brake assembly comprises a movablecontact frame connected with a trigger and a body used in cooperation with the movable contact frame. The bottom end of the moving contact frame is sequentially provided with a first fulcrum, a secondfulcrum, an electric brush frame and an electric brush driven by the electric brush frame from front to back. A first contact device used in cooperation with the first fulcrum is arranged on the sideface of the side, close to the position under the first fulcrum, of the body. A second contact device used in cooperation with the second fulcrum is arranged on the side face of the side, close to the position under the second fulcrum, of the body. A circuit board with a silicon controlled rectifier is arranged between the electric brush and the side surface of the body with the second contact device; the reversing speed regulation trigger switch with the brake function has the speed regulation function, the reversing function and the brake function at the same time.