Pressure filtration system The invention provides a sludge pressure filtration system, which comprises a pressure filter, a pneumatic tank, a feed pump and a fan; The air pressure tank is provided with two inlets and one outlet; The outlet of the feed pump is connected with the first inlet of the air pressure tank through a pipeline; The air outlet of the fan is connected with the second inlet and outlet of the pressure tank through a pipe, and the pipe is provided with a valve; The filter press includes several filter press units, front baffle, rear baffle, slide rail, and water tank. The front baffle is fixed on the external support frame and is provided with a feed hole along the axis. The slide rail is fixed on the front baffle and is provided with a filter press unit channel. The filter press unit is arranged in the filter press unit channel of the slide rail. The front end face of each filter press unit is provided with a filter press tank, The bottom surface of the filter press tank is provided with a feed channel coaxial with the feed hole of the front baffle, the bottom of the side wall of the filter press tank is provided with a water outlet and a water outlet pipe is arranged at the water outlet, the outlet of the pressure tank is connected with the feed channel of the front filter press unit through the feed pipe, and one end of the feed pipe is placed in the feed hole of the front baffle, The rear baffle is arranged in the channel of the pressure filtration unit and at the rear side of the last pressure filtration unit and connected with the external motor telescopic shaft. The water tank is arranged at the lower end of the water outlet pipe and connected with the external water tank.