The invention relates to an electrolyte and a lithium-ion battery comprising the same. The electrolyte comprises an organic solvent, a lithium salt and an additive, wherein the additive comprises a hydrogenated thiophene-boron trifluoride coordination compound and a sultone compound. The electrolyte simultaneously comprises the hydrogenated thiophene-boron trifluoride coordination compound and the sultone compound; decomposition of the electrolyte on the surface of an electrode can be inhibited under the common synergistic effect of the hydrogenated thiophene-boron trifluoride coordination compound and the sultone compound; and corrosion of an acidic material generated by the electrolyte on a solid electrolyte membrane is effectively reduced, so that the cycle performance of the lithium-ion battery at a room temperature and a high temperature and the storage performance at the high temperature can be improved.