Parking braking mechanism used for automotive transmission

The invention relates to a parking braking mechanism used for an automotive transmission. The parking braking mechanism comprises a safety mechanism and a braking mechanism, wherein the safety mechanism comprises a rotary disk, a rotary disk screw and a movable platform, and is capable of enabling the parking mechanism not to affect the vehicle to run normally when the parking mechanism works abnormally. The braking mechanism comprises a braking motor, a stop-nut, a braking screw, a chute, a slider block, a connecting rod and a brake disc, through the rotation of the braking screw, the stop-nut is driven to move, and a position of the slider block in a crank slider mechanism formed by the braking disc, the connecting rod and the slider block is limited, so that the brake disc is stopped, and the vehicle is parked. The parking braking mechanism, provided by the invention, has the advantages of compact structure, simpleness in control and operation, and capability of improving reliability and stability for parking braking, and powerfully ensuring travelling safety.