Plastic sheet is an important part of plastic products,but the existing plastic sheet production line is less automated,and the main component of raw materials is polyethylene,which is difficult to degrade.According to this,using a new type of degradable plastic as a raw material,but it is a powdery material,which cannot be applied to the traditional granular feeding device.Because of its characteristics are formed into sheets by extrusion after the mold foaming method,and the raw material has high temperature requirements,the traditional extruder cannot use the material to produce.Therefore,according to the characteristics of the raw material and processing technology,a degradable plastic sheet molding production line composed of feeding system,extrusion molding system,traction rolling system,slitting punching system and clamping and palletizing system was designed,and the hardware and software of the control system were designed using PLC and touch screen.Taking the average production cycle as a reference index,the production efficiency of the automated production line is increased by 26.5%,which can provide technical support for the large-scale application of degradable plastic products.