The invention discloses electrolyte for a high-voltage battery. The electrolyte is prepared from, by weight, 80-90% of non-aqueous solvent, 9.5-15% of lithium salt and 0.5-5% of an additive, wherein the additive is a mixture of pyridine derivatives and fluorine boron compounds with the mass ratio being (1-9): (9-1). The electrolyte for the high-voltage battery can prolong the circulating service life of the high-voltage battery.