The developed PP/PS sheet production line is used to produce multi-layer composite environmental protection sheet, which is mainly used for blister forming all kinds of food containers and packaging, such as tray, Noodle Bowl, lunch box, Cake Box, fruit plate and so on. The equipment can effectively use the proportion of stone powder, not only reduce the cost of raw materials, but also improve the degradability of sheet materials and ensure the synthesis, physical properties and subsequent processability of sheet materials.