Composite waterproof blanket and making method

The invention discloses a composite waterproof blanket and a making method, and belongs to the technical field of earthworks. According to the waterproof blanket, sodium-based bentonite is arranged between two layers of geotextile, fibers are placed between the two layers of geotextile, and a layer of light curing adhesive is arranged outside the geotextile of the lower layer to form the four-layer waterproof blanket. Adhesive coating and light curing processes are increased in the making method. The method comprises the following steps of: 1, coating the sodium-based bentonite, wherein a non-woven fabric and a woven fabric are adopted on the upper and lower layers of geotextile respectively, and the sodium-based bentonite is added between the two layers of geotextile; 2, needling compounding: selecting a needling machine, making a felting needle pass through the geotextile of the upper layer, the sodium-based bentonite and the geotextile of the lower layer, inversely hooking the felting needle to scrape the