Polyethylene polypropylene composite waterproof membrane is a new type of waterproof membrane made of raw polyethylene synthetic polymer material with anti-aging agent, stabilizer, adhesive, etc., and high-strength new polypropylene polyester filament non-woven fabric, and then compounded at one time by an automated production line. This product is developed according to modern waterproof engineering and new requirements for waterproof and impermeable materials on the basis of thorough research on existing waterproof and anti-seepage products. This product is a new type of waterproof material made of multi-layer polymer synthetic sheet material and composite processing using new technology and new technology. Scope of application The upper and lower surfaces are rough, and the non-woven fibers have an irregular intersecting structure, forming a three-dimensional mesh. It can be used stably for a long time in the ambient temperature range of -40℃ to 60℃. It is suitable for bonding a variety of materials, especially direct bonding with cement materials during solidification. It can be constructed as long as there is no clear water, and its comprehensive performance is good and tensile strength is high. Strong anti-seepage ability, good low temperature flexibility, small expansion coefficient, easy bonding, small friction coefficient, can be directly installed in sand, stable and reliable performance. It is a non-toxic, pollution-free, green and environmentally friendly product. It is suitable for industrial and civil buildings roof waterproof, ground waterproof, moisture-proof, indoor wall and floor moisture-proof, bathroom waterproof, water conservancy pool, channel, bridge culvert waterproof, anti-seepage, metallurgical chemical pollution prevention, etc. Construction operation procedure acceptance and cleaning of the base layer (leveling layer) → preparation of adhesive (prepared with use) → treatment of complex parts (yin and yang corners, cornices, downspouts, pipe holes, etc.) additional layer → construction waterproof layer → waterproof layer inspection → protective layer construction acceptance.