A synthesis method for fluoro-ethylene carbonate. The invention belongs to the technical field of battery stabilizers. The synthesis method includes the steps of: 1) under protection of inert gas, adding chloro-ethylene carbonate, a tetraalkyl halogenated amine catalyst, a solvent and a fluoride mixture into a reaction kettle with stirring and mixing, and controlling the temperature to be 60-100 DEG C to perform a halogen exchange reaction for 3-6 h to produce a crude product containing fluoro-ethylene carbonate, wherein molar ratio of the chloro-ethylene carbonate to the fluoride mixture is 1:1.0-1.1, and the mass ratio of the chloro-ethylene carbonate to the solvent is 1:0.9-1.2; and 2) purifying the crude product containing fluoro-ethylene carbonate to produce the fluoro-ethylene carbonate. The method is characterized by one-time addition of the fluorinating agent, mild reaction, high yield, convenient separation and simple operations.