The utility model discloses a water -washed tester, including control box, constant temperature storage water tank and spraying the case, spraying the upper portion opening of case and being equipped with the organic glass cover, the roof of organic glass cover is equipped with the nozzle, and the nozzle is the upper portion opening to spraying the case just, and the one side that sprays the case is equipped with the layer board that the steel sheet was surveyed in the propelling movement, and the lower part of the interior nozzle of organic glass cover is equipped with reassembling type funnel, the lower part export and the tank connection of funnel, be equipped with the water pump in the control box, the water inlet and the tank connection of water pump, the delivery port of water pump passes through high pressure hose to be connected with the nozzle, and high pressure hose is connected with manometer and bypass pipe, is equipped with the bypass valve on the bypass pipe, the export and the tank connection of bypass pipe. The ability obtains the mixed solution of the grease of being walked by the water -washed and the water of spouting, is particularly useful for testing the shield structure and seals the water -resistant momentum of grease with the shield tail and obtain to be washed away the mixed liquid of grease with the water of spouting.