Waterproof roll cutting device

The utility model provides a waterproof roll cutting device. The cutter comprises a cutter rest and a cutter body, the knife rest is detachably connected with the knife body; the knife rest is provided with a flattening device; the flattening device comprises a first flattening device and a second flattening device; the first flattening device and the second flattening device are arranged on the two sides of the cutter body respectively. A first sliding device and a second sliding device are respectively arranged at two ends of the knife rest; the knife rest is provided with a first upper flatplate and a second upper flat plate, the first upper flat plate and the second upper flat plate are arranged on the two sides of the knife body respectively and are perpendicular to the knife body, the first upper flat plate is correspondingly provided with a first lower flat plate, and the second upper flat plate is correspondingly provided with a second lower flat plate. The waterproof roll cutting device is simple in