The utility model relates to a test device for determining sludge dewatering property, which belongs to the technical field of environmental geotechnics. The test device comprises a stand, a speed regulating motor, a filtrate protection cover, a centrifuge cup, a filter bag, a seal cap cover, a metering tube, a camera device, a liquid container, a guide rail, a weighing device, a base and a computer. By using the centrifuge cup to remove water, the test device overcomes the disadvantages of vacuum filtration, such as air leakage and instable vacuum degree. The speed regulating motor is adjustable in rotation speed, so that the test device can determine the dewatering property of sludge under different separation factors. An air exhaust is formed on the filtrate protection cover; a hose is closely clung to the inner wall of the liquid container to assure stability of the filtrate in the liquid container so as to ensure the reading accuracy of the camera device; and the test parameters are set on the computer, and the test efficiency is improved greatly by automatically processing data through the computer program.