Filter press consist of frame, filter plate, pressing system and electric control cabinet. Frame consist of base, push plate and girder and supports the pressing device and filter plate. Filter plates are installed on girder between tail plate and push plate, with filter cloth sandwiched in them. In operation, the pressing device drives the push plate to press the filter plates and filter cloth between push plate and tail plate. The function of electric control cabinet is to control the process of the sludge dewatering, such as set the dewatering time, the pump pressure, the treating capacity, and so on.