"Tianhai" tunnel special composite waterproofing membrane is made of high molecular polymer (HDPE, EVA, ECB, etc.) with anti-aging agent, stabilizer, etc., high-strength non-woven fabric bonding, and geotextile with sling (signal layer) The heat is integrated into one to form a sling type composite waterproofing membrane. The extrusion calendering method can also be used to melt-plasticize the resin extruder, and the extruded molten sheet is integrated with the sling, and is formed by rolling calendering. The product can greatly simplify the construction difficulty of the traditional waterproof material in the tunnel, improve the laying quality and laying efficiency, shorten the construction period and reduce the comprehensive construction cost.