The hot inert reflective film is made by a three-layer coextrusion process, and the core layer and the lower layer of the product remain black, without affecting any technical properties of the film. A pure white pigment composed of an ultraviolet additive is added by changing the composition of the upper layer. Under the premise of not reducing the performance indicators of the products, the products have obtained unique advantages in application functions. It is a revolutionary superior product created by “Tianhai” that can adapt to various anti-seepage applications.