Lithium ion secondary battery electrolytic solution

The invention discloses a lithium ion secondary battery electrolytic solution. The lithium ion secondary battery electrolytic solution is composed of an organic solvent, an electrolyte lithium salt and an addition agent, wherein the organic solvent is composed of a component A and a component B, wherein the component A is cyclic carbonate, the B is chain carbonate, the electrolyte lithium salt is a mixing lithium salt, and the addition agent is an annular sulfate class. The electrolytic solution can improve the loading capacity and cycle performance of a battery for the first time, the electrolytic solution has the good chemical and electrochemistry stability in a wide temperature range, meanwhile, the electrolytic solution can form a stable phase interface film on a graphite class negative pole surface, and the consistency of an electrode material is improved.