Method for preparing capacitor diaphragm by recovering waste capacitor diaphragm

The invention relates to a method for preparing a capacitor diaphragm by recovering a waste capacitor diaphragm. The method comprises the following steps: crushing the waste capacitor diaphragm to obtain debris, wherein the D50 of the debris is 0.5-5 microns; subjecting the debris to vacuum drying treatment so as to obtain pretreated debris; mixing the pretreated debris with the binder; and calendering the mixed treatment product so as to obtain the capacitor diaphragm. The capacitor diaphragm prepared by the method has high tensile strength, high porosity and high liquid absorption rate, andthe initial electrical performance, the electrical performance after loading at 65 DEG C for 1000 hours and the electrical performance after cycling for 1 million times of the supercapacitor assembledby the diaphragm prepared by the method are all better than industry standards. In addition, the method has simple process, low diaphragm recovery cost and continuous production process and is quitebeneficial to popularizatio