Double-cylinder hydraulic exchange filtering device

The utility model relates to corollary equipment of a film blowing machine, in particular to a double-cylinder hydraulic exchange filtering device which comprises a rectangular heating box body, two symmetrical round holes are formed in the heating box body, and the round holes penetrate through the heating box body; a round hole is formed in the heating box body, a movable column is slidably arranged in the round hole, material ports are formed in the centers of the two sides of the heating box body, a filtering groove is formed in the movable column, an output channel penetrating through the movable column is formed in the bottom of the filtering groove, and a filtering piece is detachably arranged in the filtering groove; flow guide channels are formed in the two sides of the heating box body, and the material opening is communicated with the filtering groove or the output channel through the flow guide channels. According to the technical scheme, the two filtering devices are used, the two filtering devic