The invention discloses a waterproof coiled material. A protrusion is arranged on one side face of the waterproof coiled material, a groove is formed in the other side face of the waterproof coiled material, the adjacent protrusion and groove of the waterproof coiled material are matched with each other, the width L of the overlap edge of the waterproof coiled material is larger than or equal to 6 cm and smaller than or equal to 12 cm, the width of the protrusion and the groove is set to be La=L-2, the thickness of the waterproof coiled material is set to be h, the exposed height of the protrusion and the sunk depth of the groove are both set to be ha=K*h(0.25<=K<1, and K is a real number), and the K value meets the following function relation U=10909K<2>-9636.4K+1727.3(U is the annual precipitation of the place where waterproof engineering is located). The designed waterproof coiled material can obtain the K value according to the annual precipitation of the place where waterproof engineering is located, a reasonable ha value is obtained according to a formula ha=K*h, the designed protrusion and groove are matched in a more stable and firmer mode, the phenomenon that water channeling occurs at the overlap edge of the waterproof coiled material is effectively reduced, and the overall waterproof effect of the waterproof coiled material is greatly improved.