Rotary filter screen

The utility model discloses a rotary filter screen. The rotary filter screen comprises a rack, a drive mechanism, a transmission shaft, a chain plate, a guide rail, a mesh plate and a washing device, wherein the horizontal transmission shaft is arranged above the rack; one end of the transmission shaft is connected to the drive mechanism, and chain wheels are arranged in the middle of transmission shaft; the annular chain plate is arranged on the chain wheels in a sleeving manner, and is provided with a chain matched with the chain wheels; a guide rail matched with the chain plate is arranged at the lower part of the rack; the annular mesh plate is arranged on the chain plate in a sleeving manner; the washing device is arranged above the rack, and comprises two oscillating rods which are capable of rotating by taking the axis of the respective oscillating rod as the center; a plurality of nozzles are fixed on each oscillating rod; the oscillating rods are arranged horizontally, and the rotating direction of the oscillating rods is in accord with the rotating direction of the transmission shaft; the width direction of the duckbill water outlet of each nozzle is in accord with the axial direction of the transmission shaft; the oscillating rods are connected with an oscillation cylinder; and the oscillation cylinder is fixed on the rack. The rotary filter screen is capable of solving the problem that the mesh plate cannot be washed cleanly.