Columnar filter of extruder

The utility model relates to a columnar filter of an extruder, which effectively solves the problem that a filter screen is inconvenient to replace and clean. According to the technical scheme, the device comprises a cylindrical shell, a feeding port is formed in the upper portion of the middle of the shell, two air inlets are symmetrically formed in the two sides of the feeding port, and a discharging port is formed in the lower portion of the middle of the shell; two slag discharging openings are symmetrically formed in the two sides of the discharging opening; a filter screen assembly is mounted in the shell; the filter screen assembly comprises a middle rod, three baffles are mounted on the middle rod, two filter positions are formed among the three baffles, a first arc-shaped filter screen is mounted below the filter position on the left side, and a second arc-shaped filter screen is mounted above the filter position on the right side; the middle rod can move left and right and can rotate; the utility mo