The invention relates to the construction material field, in particular to a waterproof asphalt sealing material used outdoor, and provides a waterproof asphalt sealing material which can be used outdoor and has the properties of being waterproof, corrosion resistance and ageing resistance and has the component and weight percentage: 40 to 70 of asphalt, 14 to 20 of naphthenic oil, 4 to 12 of SBS, 5 to 10 of xylene, 5 to 10 of turpentine, 1 to 7 of zinc oxide, 0.1 to 1 of 2, 4-dihydroxybenzophenone, 0.05 to 3 of 4, 4'-thiobis(2, 6-di-tert-butylphenol), 0.1 to 1 of 4-benzoyloxy-2, 2, 6, 6-tetramethylpiperidine, and marginal water. By adopting the technical proposal, the waterproof asphalt sealing material can remain paste shape in normal temperature, can be used by opening the tank at any time, can be covered on the surface of a building or solidified after gapping, and can experience being waterproof, light resistance, corrosion resistance for more than 20 years, is resistant in water, cold, and high temperature, and can achieve good waterproof and sealing effect.