Stretching device for filtering and purifying membrane production

The utility model discloses a stretching device for filtration purification membrane production, which comprises an unwinding mechanism (1), a stretching mechanism (2) and a winding mechanism (3), the stretching mechanism (2) comprises a rack (201), two guide rails (202) distributed in parallel are arranged on the rack (201) along the stretching direction, a plurality of sliding seats (203) distributed side by side are arranged on the guide rails (202), and locking nuts (204) are arranged on the side surfaces of the sliding seats (203); bottom driven rollers (205) are arranged on the two sides of each sliding seat (203) respectively, a lifting driving air cylinder (206) is arranged in the middle of each sliding seat (203), a supporting frame (207) is arranged at the output end of each lifting driving air cylinder (206), a top driving roller (208) is arranged above each supporting frame (207), and one end of each top driving roller (208) is further connected with a driving motor (209). The stretching device ha