The latex paint for outer wall consists of water 17.0-36.0 weight portions, dispersant Hydropalat 34 in 1.0-1.2 weight portions, stabilizer Hydropalat 306 in 0.05-0.15 weight portions, pH regulator AMP95 in 0.15-0.2 weight portions, defoaming agent Defoamer 125 in 0.15-0.2 weight portions, pigment R215 in 15.0-17.0 weight portions, stuffing 1250 mesh BaSO4 in 13.0-15.0 weight portions, stuffing DB80 in 4.0-6.0 weight portions, stuffing 1000 mesh heavy calcium carbonate in 4.0-6.0 weight portions, stuffing 800 mesh wollastonite in 4.0-6.0 weight portions, defoarming agent Defoamer 121 in 0.15-0.20 weight portions, emulsion 998A in 20.0-30.0 weight portions, antiseptic LFM0.15-0.20 weight portions, filming assistant in 1.0-1.5 weight portions, thickener DSX3551 in 0.6-1.0 weight portions. The latex paint has low viscosity, high adhesion, high covering power and other advantages.