The invention discloses a power distribution cabinet epoxy coating with good air tightness. The materials comprises, by weight, 30-50 parts of bisphenol A-type epoxy resin, 10-20 parts of glycidyl ester type epoxy resin, 15-25 parts of bisphenol F-type epoxy resin, 4-10 parts of modified asbestos, 4-8 parts of barium titanate, 8-16 parts of zeolite, 4-8 parts of molybdenum disulfide, 4-8 parts of mica powder, 4-8 parts of attagel, 6-12 parts of aluminum borate whisker, 3-7 parts of magnesium hydrate, 4-8 parts of barium metaborate, 10-16 parts of zinc phosphate, 4-8 parts of trimethyl phosphate, 2-4 parts of film coalescing aid, 10-18 parts of diamine methyl cyclohexane, 4-8 parts of defoaming agent, 1-3 parts of antimicrobial agent, 10-20 parts of poval and 50-90 parts of water. The power distribution cabinet epoxy coating with good air tightness not only has a good air tightness, but also has a strong surface adhesion, an ultrahigh heat stability and anti-corrosion property, at the same time, the coating toughness is effectively strengthened, and even in the face of strong impact, the coating does not crack.