The invention relates to a rotary pressure filter which belongs to machineries for continuously separating solid and liquid suspensions or slurries. The rotary pressure filter is characterized in that the inner side of a filtering and rotating body (1) is uniformly distributed with filter tank type independent filtering units (1-1) along the circumference direction; a sealing boot (8-2) in a filtering device (8) covers partial filtering units to form a hydraulic filtering cavity (8-3); a still central pipe (2) is arranged in the filtering and rotating body, and a rectangular material receiving port arranged on the top of the still central pipe (2) is connected with a sealing and isolating device (11); pressurized gas, materials, and the like enter a channel and a discharge device (13) is put in the central pipe (2); the sealing and isolating device (11) divides the rotating body (1) into a pressure cavity and a normal pressure cavity; the materials enter the hydraulic filtering cavity(8-3), rotates along with the rotating body (1) and then is formed into a filter cake respectively through the processes of hydraulic filtering, washing, gas-phase pressurizing and filtering, drying, and the like; the filter cake enters the normal pressure cavity and is unloaded through gas-phase blowback and discharged from the discharge device (13); and filter liquid is gathered to a gas-liquid two-phase switching control head (17) through a gas-liquid two-phase channel (18) and drained.