The invention belongs to the field of bicycle accessories, and particularly relates to a heat radiation bicycle seat cushion. The seat cushion comprises a cushion body, openings are formed in both sides of the front end of the cushion body, a first liquid storage bag and a second liquid storage bag are fixedly connected inside the openings respectively, the first liquid storage bag and the secondliquid storage bag all adopt an elastic material, the first liquid storage bag and the second liquid storage bag are filled with a coolant, a cooling passage is connected between the first liquid storage bag and the second liquid storage bag, the cooling passage is arranged in a wave shape on the rear portion of the cushion body, the inner side wall of the cushion body is fixedly connected with aheat radiation block, a connecting tube penetrates through the heat radiation block, the two ends of the connecting tube are respectively connected to the first liquid storage bag and the second liquid storage bag, and a first check valve and a second check valve are fixedly connected to the two ends of the connecting tube. The seat cushion drives the flow of the coolant and the exhaust of the seat cushion by using a rider as a power, and not only has better ventilation and heat dissipation, but also is energy-saving and environmental-protection.