The invention relates to a heat dissipation cap, in particular to a sweat collection heat dissipation cap for electric power overhaul. The heat dissipation cap comprises a condensing device, a collection device and a detection device, the condensing device comprises a liquid collection block and a condensing pipe, the detection device comprises a floating rod, a floating ball, a rotating ball, a fixing block, a motor, a trigger, a gear, a rack and a water stop valve, the floating ball is arranged at one end of the floating rod, the trigger drives the motor to rotate forwardly and reversely, the fixing block is arranged on the side wall of a liquid collection vessel, the rotating ball is arranged in the liquid collection vessel, the floating rod penetrates a center point of the rotating ball, the trigger is arranged on the lower portion of the other end of the floating rod, the water stop valve is arranged between a water conveying pipe and the liquid collection vessel, one end of the rack is connected with the water stop valve and arranged on the wall of the water conveying pipe, the gear is matched with the rack, the motor is arranged on the side surface of the gear, and an output shaft of the motor is connected with the gear. The heat dissipation cap has the advantages that heat dissipation is accelerated, and sweat is effectively recycled.