"Tianhai" bentonite waterproof blanket is filled with high-expansion sodium bentonite between the woven fabric and non-woven fabric. The upper layer of non-woven fabric fiber is used to lock the bentonite to the lower layer of composite woven fabric through special knitting method. On the top, many small fiber spaces are formed, so that the bentonite particles cannot flow in one direction. When water is encountered, a uniform high-density rubber head water layer is formed in the mat to seal, isolate and prevent leakage, and the effect is good and damage resistance.