The invention discloses a water erosion test device which comprises a high-voltage pulse water jet device and a workpiece clamping table; the high-voltage pulse water jet device comprises a water tank and a water pumping device, wherein the water pumping device is connected with the water tank, a water outlet pipe of the water pumping device is connected with a water return pipe and a jet pipe, a pressure gauge and a nozzle are installed on the jet pipe, the water return pipe is connected with the water tank, and a pressure relief valve is arranged on the water return pipe; the nozzle is arranged above the workpiece clamping table; and the water erosion test device also comprises a control plate, and the control plate is connected with the water pumping device, the pressure gauge and the pressure relief valve of the high-voltage pulse water jet device and a motor and a hoisting device of the workpiece clamping table through leads. Compared with the prior art, the device has the advantages that the equipment structure is simple, and meanwhile, the water erosion test process also can be accurately simulated, the test cost is greatly lowered, and the device is easy to control and has short test time.