The invention belongs to the technical field of a lithium ion battery, and particularly relates to a lithium ion battery electrolyte and a lithium ion battery comprising the same. The electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises a bridge ring anhydride additive and a low-impedance additive, and the bridge ring anhydride additive is at least one of compounds shown in a formula I, a formula II, a formula III and a formula IV. Compared with the prior art, the electrolyte has the advantages that the bridge ring anhydride additive participates in formation of a negative electrode SEI film, a protection film is also formed at a positive electrode, gas generation of the battery is prevented, the high-temperature storage performance and the cycle property of the battery are improved, and the demand of a power battery and a high-energy density battery can be satisfied.