The utility model discloses a heat dissipation device for a gas drainage pump. The heat dissipation device for the gas drainage pump comprises a heat exchange sleeve, wherein the heat exchange sleeve is arranged on the outer wall of a motor of the gas drainage pump in a sleeved mode, the heat exchange sleeve comprises an arc-shaped water inlet pipe and an arc-shaped water outlet pipe, sealing plates are arranged at the two ends of the arc-shaped water inlet pipe and the two ends of the arc-shaped water outlet pipe respectively, a plurality of straight heat exchange pipes are arranged between the pipe wall of the arc-shaped water inlet pipe and the pipe wall of the arc-shaped water outlet pipe, a water inlet manifold is connected to the arc-shaped water inlet pipe, a water inlet gate is arranged on the water inlet manifold, a water drain manifold is connected to the arc-shaped water outlet pipe, and a water drain gate is arranged on the water drain manifold. According to the heat dissipation device for the gas drainage pump, the temperature of the gas drainage pump can be effectively lowered; compared with a cooling measure in the prior art, power consumption and the cooling cost are reduced, management through a specially-assigned person is not needed, the human cost is reduced, and the fire hazard is eliminated.