The invention relates to an automobile drum type brake heat dissipation system, and belongs to the technical field of automobile brakes. The automobile drum type brake heat dissipation system comprises an axle, a hub, a brake drum and a brake shoe, wherein the hub is connected with the brake drum, the brake shoe is configured in an inner cavity of the brake drum, and the automobile drum type brake heat dissipation system is characterized in that a wind wheel or a fan blade is arranged in the inner cavity of the brake drum, an air inlet is formed in the outer side of the brake drum, and an air outlet is formed in the other side of the brake drum. The automobile drum type brake heat dissipation system achieves forced ventilation heat dissipation in the inner cavity of the relatively-sealed brake drum, the exterior cold air can continuously enter the inner cavity of the brake drum, the effects of heat dissipation and cooling are achieved, and therefore performance stability and normal operation of the automobile brake system are ensured. The forced ventilation of the inner cavity of the brake drum enables the inner cavity of the brake drum to keep clean and the good ventilation effect, and the heat dissipation effect of the automobile drum type brake can be further improved. The automobile drum type brake heat dissipation system is simple in structure, reasonable in design, reliable in use performance, safe and reliable in operation, long in service life, capable of conveniently conducting refit on an existing automobile, and beneficial to saving energy and protecting environment.