The invention relates to the technical field of engineering machinery and particularly relates to a cavitation eliminating device. The cavitation eliminating device comprises a pump body. The cavitation eliminating device is characterized in that a cavitation eliminating device is arranged on the pump body and comprises an electric valve, a control device, an air inlet pipe, exploring tubes and a flow probe, wherein an air hole is formed in the pump body, the flow probe is arranged at a water inlet of the pump body, the exploring tubes are inserted into the air hole, air outlets of the exploring tubes are communicated with a cavitation region of the pump body, air inlets of the exploring tubes are communicated with the atmosphere through the air inlet pipe, the electric valve is arranged at the end of the air inlet pipe, and the flow probe and the electric valve are respectively connected with the control device. By utilizing the structure, the working efficiency of a water pump is not influenced, and long-term major damages caused by a cavitation phenomenon to the water pump are thoroughly solved; the cavitation eliminating device has the advantages of simple structure, convenience in operation, low cost, reliability in use and the like.