Heat-dissipating device for hydraulic brake system

A heat-dissipating device for hydraulic brake system is provided. The device includes a heat-dissipating element (1) and a plurality of heat-dissipating tube units (3). The heat-dissipating element has a heat-dissipating portion which has large surface area, and is located between a brake mechanism and an oil tube (5). The heat-dissipating tube units are sleeved around the oil tube in order. Thereby, the heat generated by the brake mechanism can be dissipated rapidly by the heat-dissipating element (1) and the heat-dissipating tube units (3), so as to promote performance of the brake mechanism.