The present invention discloses a braking speed limiting device, comprising: a
brake housing, a power input mechanism, a speed limiting mechanism and a braking mechanism; the speed limiting mechanism comprises: a
brake disc, a speed limiting block, a friction plate and a first elastic element; when the power input mechanism inputs torque, the speed limiting block is driven to rotate, and the speed limiting block is swung toward the inner wall of the
brake housing under the action of
centrifugal force, so that the friction plate installed on the speed limiting block contacts the inner wall of the brake housing to generate friction, thereby playing a speed limiting role; the braking mechanism comprises: a manual trigger device, a
cam body, a brake ring, a second elastic element and a
brake pad; the manual trigger device drives the
cam body to rotate, and the brake ring is installed on the eccentric part of the
cam body. When the cam body rotates, the brake ring is driven to move radially, so that the
brake pad installed on the brake ring is disengaged or tightly holds the brake disc, and the brake disc is linked with the power input mechanism, thereby realizing braking control. The present invention has the advantages of convenient control, automatic speed limiting, reliable braking, etc., and is suitable for various hydraulic winches.