The invention discloses a device for improving heat exchanging effect of a water cooling type cooler. The device is characterized in that an inverted draining pipeline is connected to a cooling water inlet of the water cooling type cooler, wherein an inverted draining valve is mounted on the inverted draining pipeline; a gas ejecting pipeline on which a gas ejecting valve is mounted is connected to a cooling water outlet of the water cooling type cooler. The device further comprises a gas source storing tank on which a pressure gauge is mounted; the gas source storing tank is connected with a supplementing gas source through a gas supplementing pipeline; a self-adjusting valve is mounted on the gas supplementing pipeline. When the device is in use, a water feeing valve at the cooling water inlet of the cooler is closed, the inverted draining valve is opened, and then the gas ejecting valve is opened; gas is ejected through the gas ejecting pipeline, and the gas-water mixture flashy flows in an inverted direction in the water cooler, thus clays and dirt attached on the inner wall of the water cooler and the outer wall of a heat exchanging pipe can be removed and discharged out of the system through the inverted draining system, and as a result, the heat exchanging effect of the water cooler is ensured; the self-adjusting opening is set, so that the pressure of a gas ejecting buffering tank is ensured to be beyond the pressure of cooling water.