The invention discloses a weather-proof concrete surface wear-resisting agent comprising oxalic acids and styrene-acrylate emulsions, wherein the proportion of the oxalic acids to the styrene-acrylate emulsions is 1:5. The weather-proof concrete surface wear-resisting agent is suitable for the surface coatings of structures, i.e. piers, girders, and the like and less influenced by factors, i.e. climates, temperature, concrete mix proportion, and the like, and has the advantages of easiness for construction, little volatility, enhancement on painting effect, painting material saving, little project cost increase and no environmental pollution.