The invention discloses a chemical slurry pressure filter system. The system comprises one belt filter press, one box filter, one pressure filter, one squeezing filter, one sterilization device, one sedimentation tank, one waste liquid pool, one liquid collection pool, four slag storage tanks, three buffer tanks, six feeding pumps, five circuit switches and fifteen valves. The pressure filter comprises a driving motor, a clutch, a transmission shaft, a distributor head, a ball bearing, a left end cover, an outer cylinder main body, a sealing cover plate, a sealing spacer block, a filter screen, an inner cylinder main body, a drainage pipe, a packing seal, a right end cover, a roller bearing, an outer cylinder support base, a side support, a scraper discharge device, an unloading box, a reducer and a lubrication device.