The utility model provides a net piece side cut device, including arranging the side cut unit in the frame both sides, the side cut unit includes cylinder and cutter down, and the cylinder end fixinghas an end plate, the piston rod of cylinder passes the end plate and links to each other with the knife rest, and the piston rod direction of motion and the plummet direction of cylinder are the contained angle formula arranges, be fixed with cutter and guide bar on the knife rest, seted up the through -hole on the end plate, in the through -hole was arranged in to the pole body of guide bar, thedirection direction and the piston rod direction of motion of guide bar were unanimous. Go up cutter and the cutter cooperation down silk of cutting through the metal, piston rod of the cylinder's suspension end receives the moment of flexure when great, and the pole body of guide bar supports and leans on on the downthehole wall of through -hole, prevents that the cutter from slightly rocking, moment of flexure that suspension end that the at utmost reduces piston rod of the cylinder received, and when guaranteeing metal silk effect of cutting, stability that improve equipment moved reducesthe wearing and tearing of cylinder as far as possible, prolongs long cylinder's life.