The invention discloses a winch. One end of a first brake arm of a brake, one end of a second brake arm of the brake, one end of a driving telescopic rod provided with a driving device and one end of a driven telescopic rod are hinged to a brake seat; the other end of the first brake arm, the other end of the driving telescopic rod and the other end of the driven telescopic rod are hinged to one arm of an L-shaped connecting rod; the other end of the second brake arm is hinged to a linear connecting rod, and the other end of the linear connecting rod is hinged to the other arm of the L-shaped connecting rod; a first brake block is mounted on the inner side of the first brake arm, and a second brake block is mounted on the inner side of the second brake arm. The inner arc surface of the first brake block and the inner arc surface of the second brake block hold a brake wheel on a high-speed shaft of a speed reducer during braking. The performance of an arm type crane product can be improved with the adoption of the winch.