The invention relates to a lithium ion battery electrolyte. The lithium ion battery electrolyte comprises a lithium salt, a solvent and additives, wherein the additives are selected from one or combination of the structures: FORMULA which is as shown in the specification, wherein R1, R2, R3, R4 and R5 are independently selected from any one kind of hydrogen group, alkyl group, alkoxy, alkylene, alkyl halide group, alkyl halide oxygen group, alkenyl halide group, hydroxyl, carboxyl, ether oxygen group or halogen, wherein the halogen is F, Cl or Br; A is group constituted by O, S, N or P; and R6, R7, R8, R9 and R10 are independently selected from any one kind of hydrogen group, alkyl group, naphthenic group, alkoxy, phenyl group, fluoroalkane group, fluoro-naphthene group, fluoroalkoxy group, fluorophenyl, fluoro-phenoxyl and a fluoro group which is constituted by O, S, N and P, wherein the halogenating or fluorination is wholly substituted or partially substituted. The lithium ion battery electrolyte provided by the invention has anti-overcharge and flame-retardant functions, and has relatively low adverse influence on the performance of the battery.