The invention discloses water-based flame-retardant fluorosilicon oil, which has a chemical structure as shown in the specification, wherein each R1 is independently alkyl group or aryl group; R is aperfluoroalkyl group with 4-8 carbon atoms; Q is an alkylidene group which at least contains two carbon atoms; R2 is as shown in the specification; R3 is a polyoxyethylene polyoxypropylene ether chain; R4 is an aryl group; and R5 is an alkyl group. The water-based flame-retardant fluorosilicon oil is obtained by copolymerization of the following raw materials (by weight): 20-82 parts of phenylcyclosiloxane, 20-90 parts of vinylcyclosiloxane, 23-66 parts of alkylcyclosiloxane, 40-200 parts of methyldimethoxysilane, 40-80 parts of fluorinated alkene, 20-56 parts of allyl phosphate, 200-800 partsof glycerin-monoallylether-terminated polyoxyethylene polyoxypropylene ether and 1-10 parts of an end-capping reagent. The water-based flame-retardant fluorosilicon oil requires no organic solvent, is green and environmentally-friendly, has good flame-retarding effect and good release effect, and can be applied in many fields.