Lithium ion battery electrolyte and lithium ion battery

The invention discloses a lithium ion battery electrolyte which comprises a conductive lithium salt, an organic solvent and an additive, the additive is prepared from at least two of ethylene sulfate, triallyl isocyanurate and an isocyanate compound; the additive accounts for 0.1-6% of the total mass of the lithium ion battery electrolyte; the conductive lithium salt comprises at least one of lithium hexafluorophosphate, lithium tetrafluoroborate and lithium bis (fluorosulfonyl) imide; the conductive lithium salt accounts for 8-20% of the total mass of the lithium ion battery electrolyte; an organic solvent including a cyclic organic solvent and a linear organic solvent; the addition amount of the organic solvent accounts for 60-80% of the total mass of the lithium ion battery electrolyte. In addition, the invention also discloses a lithium ion battery. The method is scientific in design, can optimize positive electrode film formation, inhibits impedance increase of the lithium ion battery in circulation and