The invention relates to vinylacetate nonsoap emulsion, redispersible rubber powder and preparation methods thereof. The vinylacetate nonsoap emulsion comprises the following components in percentage by mass: 5 to 10 percent of protective colloid, 0.1 to 0.5 percent of sodium bicarbonate, 30 to 60 percent of vinylacetate, 5 to 30 percent of tertiary vinyl carbonate, 5 to 30 percent of butyl acrylate, 0.5 to 5 percent of emulsifier, 0.1 to 0.5 percent of initiator and the balance of water. The redispersible rubber powder is prepared by spray-drying the mixture of the following components in percentage by mass: 70 to 80 percent of vinylacetate nonsoap emulsion, 5 to 15 percent of protective colloid, 5 to 15 percent of anticaking agent and the balance of water. Compared with the conventionaldispersible polymer powder, the redispersible rubber powder can improve the new stirring performance, mechanical performance and adhesive performance of modified mortar obviously.