The utility model relates to the technical field of a filtering device, and particularly relates to a pressure type continuous-flow filter which comprises a main tank body, a sand washing cylinder and a sand extraction pipe, wherein a communication port and a water outlet are formed at the upper end of the main tank body; a backwashing water outlet pipe is fixed at the top end of the sand washing cylinder in a communicated manner; a backwashing valve is fixedly mounted on the backwashing water outlet pipe; the lower end of the sand washing cylinder is fixed at the upper end of the main tank body and communicated with the communication port; a pneumatic valve is fixedly mounted between the lower end of the sand washing cylinder and the communication port; the sand extraction pipe is fixedly mounted on the main tank body; the upper end of the sand extraction pipe is fixed at the middle part of the sand washing cylinder in a communicated manner; the lower end of the sand extraction pipe is positioned at the lower end of an inner cavity of the main tank body; a sand inlet valve is fixedly mounted on the sand extraction pipe; a water inlet pipe is fixed at the middle part of the main tank body; and a discharge port is formed at the bottom end of the main tank body. The pressure type continuous-flow filter provided by the utility model is reasonable and compact in structure and convenient to use; the filter material can be subjected to backwashing at the time of filtering; and the pressure type continuous-flow filter has the characteristics of high filtering accuracy, good backwashing effect and low cost.