Vinyl-terminated fluoropolysiloxane (FSI) was prepared with 1,3,5-trimethyl-1,3,5 (trifluoroethyl) cyclotrisiloxane (D3F), octamethylcyclotetrasiloxane (D4) and tetramethyltetravinyl cyclotetrasiloxane (D4vi) as functional monomers using alkali glue as the catalysis. The plastic grade polypropylene (PP), perfluorohexylethylene (TE-6), trimethylolpropane triacrylate (TMPTA), and maleic anhydride grafted PP (MAH-g-PP) were used as matrix resin, secondary hydrophobic modifier, crosslinking agent, and compatibilizer respectively. As a result, interpenetrating network FSI/PP composite hydrophobic material was formed by high temperature melt polymerization. The structure of the composites was characterized by FTIR. The comprehensive properties and surface morphology of the composites were analyzed by tensile testing machine, contact angle measuring instrument, SEM, AFM, and TG-DSC. The results showed that when the amount of D4Vi end capping agent was 0.05wt% of the total FSI, the usage of MAH-g-PP was 6wt% of the total FSI/PP, and the addition of TMPTA was 3wt% of the total FSI/PP, the hydrophobic angle of FSI/PP reached 138.3o and the oil hydrophobic angle reached 46.1o, which was 55.56% and 157.54% higher than that of pure PP respectively.