Brake mechanism of winch

The utility model discloses a brake mechanism of a winch, and belongs to the field of winch brake mechanisms. The brake mechanism comprises a handwheel, a screw rod, a connecting plate, a driving plate, a brake belt bracket and a brake belt, wherein the wrap angle of the brake belt is 337 degrees. The brake mechanism has the benefit that as the wrap angle of the brake belt is increased to be 337 degrees, the friction force of the brake belt is enlarged under the same condition. Therefore, the product performance is improved; and the safety is enhanced.