The utility model relates to a laying trolley for a waterproof layer of a tunnel, in particular to a multifunctional laying trolley for the waterproof layer of the tunnel. The problems of high labor intensity and poor laying quality of the conventional waterproof material laying for the tunnel are solved. The multifunctional laying trolley for the waterproof layer of the tunnel comprises a frame with traveling wheels. Winding drums are triangularly distributed in parallel on the front part of the frame. A waterproof support frame fixed on the frame is arranged on the rear sides of the winding drums. A crawling welder is fixed on the waterproof support frame. A nail gun bent frame and an adhesion bent frame are fixed on the frame on the rear side of the crawling welder. The multifunctional laying trolley has the advantages of rational, reliable and simple structural design, time saving, labor saving, convenience for operation and low cost; the problems of high labor intensity and poor laying quality of the conventional waterproof material laying for the tunnel are solved; a distance between shot nails is ensured; and geotextile and a waterproof board can be laid at the same position.