Lithium-supplementing solid electrolyte coating diaphragm and lithium ion battery

The invention provides a lithium-supplementing solid electrolyte coating diaphragm and a lithium ion battery, the lithium-supplementing solid electrolyte coating diaphragm comprises a base membrane and a lithium-supplementing coating formed on at least one surface of the base membrane, and the lithium-supplementing coating comprises a lithium salt, a solid electrolyte, a binder and a surface affinity agent; the lithium salt is selected from one or more of lithium iron phosphate, lithium cobalt oxide and lithium manganate; the solid electrolyte is selected from one or more of perovskite type solid electrolyte, garnet type solid electrolyte, NASICON type solid electrolyte, Li2ZrF6 and cryolite. The lithium-supplementing solid electrolyte coating diaphragm is prepared into a battery cell, so that the problems that lithium-supplementing components in a common lithium-supplementing diaphragm coating are unstable and easy to react, and a lithium-supplementing material and a battery system are poor in safety and com