The invention relates to a core/shell type organosilicone-modified acrylate emulsion and a preparation method and application thereof. The core/shell type emulsion is prepared through polymerization based on the core/shell emulsion polymerization technology and is prepared from, by weight, 500-850 parts of acrylate mixed monomers, 150-500 parts of organosilicone monomers, 10-50 parts of an emulsifying agent, 5-12 parts of an initiating agent, 5-50 parts of a crosslinking agent and 1000-4000 parts of water, wherein acrylate mixed monomers are composed of methyl methacrylate, butyl acrylate and acrylic acid at the mass ratio of (1.0-3.5):(6.5-9.0):(0.15-0.75), and a seed emulsion in the core/shell emulsion polymerization technology is obtained through polymerization of the acrylate mixed monomers. The core/shell type emulsion is good in stability, the mean grain size is 170 nm or so, and an emulsion film has an excellent film-forming property, an excellent bonding property, low surface energy and good waterproofness.