In this paper, the polysiloxane anionic emulsion and the polyacrylate latex include silane coupling agent was prepared at first. And a high organo silicon content silicone-modified polyacrylic emulsion was synthesized by graft copolymerization reaction between polysiloxane anionic emulsion and polyacrylate latex. Results showed that when mass fraction of silicone was 20％，the polymer emulsion film was in the best performance. Compared with the polyacrylate latex film，its contact angle of silicone-acrylic emulsion film was changed from 77.5。 to 95。. Its water absorption in 24h was decreased from 4.9％ to 2.3％. Hydrophobic property was improved a lot. Furthermore, its Tg was decreased from 8.53℃ to -1.36℃. Compliance of polymer chain was improved. The silicone-acrylic emulsion of high organosilicon content can be used as a kind of hydrophobic functional polymeric material.