The invention provides an anticorrosion epoxy powder paint used outside a marine steel pipe pile, which is characterized in that, the formula of the anticorrosion epoxy powder paint comprises the following components in percentage by weight: 40-60 percent of phenol-modified epoxy resin, 0-20 percent of bisphenol A epoxy resin, 0-20 percent of linear phenol curing agent, 5-25 percent of phenol curing agent, 0.3-1.5 percent of 2-phenylimidazole, 0.2-1 percent of silane coupling agent, 0.2-3 percent of gas phase white carbon, 0-2 percent of hydroxy-phenyl benzotriazole ultraviolet absorbent and hindered amine light stabilizer, 0-5 percent of modified polyfluortetraethylene wax, 5-25 percent of glass powder, 5-30 percent of talcum powder, silicon powder and mica powder, 5-10 percent of aluminium triphosphate, iron red, rutile titanium pigment and cuprous oxide and 0-3 percent of pigment. The paint provided by the inventon has the advantages that the surface roughness of a coating satisfies the required built-in strength of a steel pile and the marine geological condition of the steel pile, and the paint has the characteristics of excellent scratch resistance, shock resistance, abrasion resistance, marine biological fouling resistance, ageing resistance, ultraviolet irradiation resistance and the like.