The invention discloses a polyurethane white primer for wooden ware protection. The primer is prepared by mixing the following components in percentage by mass: 25.0 to 35.0 percent of stearic acid modified short-oil alkyd resin, 0.1 to 0.5 percent of antifoaming agent, 5.0 to 10.0 percent of organic soil slurry, 35.0 to 45.0 percent of white bottom slurry, 1.0 to 5.0 percent of zinc stearate, 5.0 to 15.0 percent of talcum powder, 0.1 to 0.5 percent of drier, 1.0 to 5.0 percent of propylene glycol methyl ether acetate, 0.1 to 0.5 percent of deodorant and 1.0 to 5.0 percent of butyl ester. The wood lacquer of the invention is series variety of which m (a paint) to m (a curing agent) to m (a diluent) is equal to 4:1:1. The wood lacquer is obviously better than the series varieties of which m (the paint) to m (the curing agent) to m (the diluent) is equal to 1:0.5:1. The primer film prepared from the wood lacquer has the advantages of fullness, moderate hardness, very good closure, and good rubbing property and is environmentally-friendly; and the novel polyurethane white primer has excellent comprehensive performance.