The invention relates to an anti-deformation device used for an extruding machine and in particular relates to an extruding machine auxiliary device. The anti-deformation device is composed of a fixed suspension beam and a cross arm, wherein the suspension beam is a cuboid plate; the top end of the suspension beam is connected with one end of the cross arm by a hinge I; the cross arm is in a frame type; transmission rollers are horizontally arranged in the cross arm sequentially; a hinge II at the lower end of the suspension beam is connected with two support rods; radial through holes I are formed in the front ends of the support rods; bumps are arranged on both sides of the lower part of the front end of the cross arm; through holes II are formed in the bumps; the through holes I and the through holes II are in alternated limit fixing through a fixed rod; and more than three screw holes are formed in the suspension beam. The anti-deformation device used for the extruding machine is simple in structure, low in manufacture cost, convenient to install and low in device cost. The anti-deformation device can be installed on the existing extruding machine for use, the defect that extruded soap end and final tail end are deformed without a bearing object is avoided, materials are saved, resource utilization is maximized, the production cost is reduced, and product yield is improved.