Application of PE/PP geocell production line products: used to stabilize road and railway subgrade. Sheet extrusion machine of geocell production line used for dike and shallow water channel treatment under load. Mixed retaining wall for preventing landslide and bearing load. When encountering a soft foundation, using geocell can greatly reduce the labor intensity of construction, reduce the thickness of subgrade, and the construction speed is fast, the performance is good, and the project cost is greatly reduced.