The invention relates to a water fluorocarbon paint for external-wall painting, comprising solvent (water), water fluorocarbon latex, filler, composite film-forming auxiliary agent, disperser, moistening agent, leveling agent, thickening agent and germicidal agent. In the paint, solvent (water) covers 5 to 15 percent, water fluorocarbon latex covers 40 to 70 percent, composite film-forming auxiliary agent covers 5 to 14 percent, rutile titanium pigment covers 10 to 25 percent, talc powder covers 5 to 10 percent, disperser covers 0.1 to 0.5 percent, moistening agent covers 0.001 to 0.003 percent, leveling agent covers 0.004 to 0.01 percent, thickening agent covers 1 to 1.8 percent, and antifoaming agent covers 0.01 to 0.05 percent. The invention provides an efficient novel water fluorocarbon paint for external-wall painting by changing fillers and increasing the dose of composite film-forming auxiliary agent. The preparation process is simple, the paint is free of dehiscence, spurging and whitening; the painted wall-surface is smooth, and the light and color are well reserved; the paint has sound flexibility, weathering resistance, corrosion resistance, heat/cold resistance, acid/alkali resistance and better film-forming performance; the paint is environment-friendly, low-cost and construction friendly; and the prospect of development is very bright.