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The application relates to the technical field of secondary batteries, in particular to a high-pressure-resistant lithium ion battery electrolyte. The electrolyte comprises a solvent, a lithium salt, a non-polar diluent and a sulfur-based additive represented by formula (1), (2) or (3). The solvent comprises a carbonic acid ester solvent; the lithium salt is dissolved in the solvent; the mass fraction of the non-polar diluent in the electrolyte is 21%-60%; and the mass ratio of the sulfur-based additive to the non-polar diluent is 1:200-1:10. The electrolyte can improve the cycle capacity of the lithium ion battery and ensure that other performances of the lithium ion battery remain stable.