Preparation method of polymer electrolyte membrane and lithium-ion battery

The invention discloses a preparation method of a polymer electrolyte membrane and a lithium-ion battery. In order to achieve the targets, with aramid non-woven as a support layer, a gel polymer electrolyte membrane skeleton is prepared by a method of coating the supporting layer with a polymer; a common diaphragm is replaced with the electrolyte membrane skeleton; a dry battery core is prepared by a winding or laminating technology; and the lithium-ion battery containing the polymer electrolyte membrane is obtained by the procedures of high-temperature baking, filling liquid electrolyte, standing, forming and packaging. The polymer electrolyte membrane disclosed by the invention is high in mechanical strength and excellent in electrochemical property; the safety performance of the battery is greatly improved when the electrochemical property is reduced hardly; and the polymer electrolyte membrane has high practical value.