The invention discloses a hydraulic sealing type pressurization belt type filter which comprises a rack, a driving wheel and a driven wheel, wherein the driving wheel and the driven wheel are pivotedon the rack; a piece endless filtering cloth is wound between the driving wheel and the driven wheel; the driving wheel is driven by a speed reduction motor to rotate to drive the filtering cloth to move forwards; a lower pressing cavity is formed corresponding to the part below a horizontal section of the filtering cloth in the rack; a grid plate is fixedly arranged above the lower pressing cavity; an upper pressing cavity is formed corresponding to the lower pressing cavity in the rack; bodies of at least two secondary hydraulic cylinders are connected with the rack; piston rods of the second hydraulic cylinders are connected with the upper end of the upper pressing cavity; an upper pressing cavity sealing ring is arranged on the opening in the lower end of the upper pressing cavity; a plurality of process pipelines are arranged inside the upper pressing cavity; the plurality of the process pipelines comprise a pulp inlet, a washing liquid inlet, an drying air inlet, a pressurized air inlet and one or more process outlets which are controlled to be opened and closed respectively. The hydraulic sealing type pressurization belt type filter needs no belt or caterpillar band conveying, and integrated functions of washing, air drying and pressurization can be achieved.