The invention discloses a filter press which comprises a workbench with water delivery holes, a mud box located above the workbench, and a pressure head, a water suction pump and a vacuum pump which are located above the workbench. The mud box is provided with an opening in the upper end and comprises an enclosing plate and a support plate, the bottom of the enclosing plate is connected with the upper end of the support plate, the mud box and the pressure head can move along the vertical direction, the lower end of the mud box is abutted against a bearing surface on the workbench, the pressure head can extend to the mud box, a weep hole is arranged in the lower end of the mud box, a cavity is formed in the pressure head, water suction holes communicated with the cavity are formed in the lower end of the pressure head, a first filter cloth covering the water suction holes is arranged at the lower end of the pressure head, a second filter cloth which is movable is arranged between the bearing surface and the lower end of the support plate, and the water suction pump and the vacuum pump are communicated with the cavity. By the arrangement, the dehydration rate and solid content of mud cakes of the filter press can be increased, and the filter press is reliable in running, easy to manage and convenient in maintenance.