A redispersible emulsion powder which is suitable for use in or as a cement admixture, powder coating material, powder adhesive, etc. The emulsion powder is excellent in miscibility with the inorganic fillers, polyvalent inorganic salts, and the like used for construction/building and in redispersibility and workability and is suitable for use as an admixture for ultrahigh-early-strength cements. The powder comprises vinyl copolymer particles having an anion-modified polyvinyl alcohol adsorbed on the surface thereof. The powder is obtained preferably by emulsion-polymerizing a vinyl monomer composition in an aqueous medium in the presence of an anion-modified polyvinyl alcohol and drying the resultant aqueous urea formaldehyde resin powder. The anion-modified polyvinyl alcohol is preferably selected among a polyvinyl alcohol modified with a sulfonic acid, a polyvinyl alcohol modified with a carboxylic acid, and a mixture of both.