Flame-retardant asphalt-based waterproof coiled material

The invention discloses a flame-retardant asphalt-based waterproof coiled material, and belongs to the technical field of waterproof coiled materials. The preparation method of the flame-retardant asphaltic waterproof coiled material comprises the following steps: S1, heating 80-95 parts by weight of asphalt to 190-200 DEG C, adding 12-14 parts by weight of aromatic hydrocarbon oil, uniformly stirring, cooling to 180-190 DEG C, adding 12-16 parts by weight of styrene-butadiene-styrene block copolymer, heating to 190-200 DEG C, stirring, adding 10-22 parts by weight of tackifying resin and 5-13 parts by weight of waste rubber powder, uniformly stirring, and cooling to 180-190 DEG C; 4-8 parts of modified hexagonal boron nitride is added after heat-preservation stirring, heat-preservation stirring continues to be conducted, and a mixture is obtained; s2, the mixture is subjected to melt extrusion and then pressed into a sheet, then cooling, edge cutting, traction and rolling are conducted, the asphalt-based wat