The invention relates to copolymer emulsion containing a fluorinated monomer and a synthetic method thereof. The copolymer emulsion is prepared from the following raw materials in parts by weight: 10 to 30 parts of dodecafluoroheptyl methacrylate, 5 to 10 parts of methyl methacrylate, 10 to 25 parts of butyl acrylate, 10 to 20 parts of styrene, 0.2 to 1 part of initiator, 0.05 to 1 part of chain transfer agent, 8 to 12 parts of organic solvent, 1 to 5 parts of compound emulsifier, 1 to 5 parts of co-emulsifier, and the balance of deionized water, totaling 100 parts. The copolymer emulsion containing the fluorinated monomer has good water-proof and oil-repellent effects.