Lithium ion battery diaphragm, preparation system and preparation method

The invention relates to the field of lithium battery processing, and, in particular, to a lithium ion battery diaphragm, a preparation system and a preparation method. The preparation method comprises that: a diaphragm to be stretched intermittently passes through a base and a longitudinal extrusion adjusting seat; the longitudinal and transverse stretching driver is connected with electricity to drive the two diaphragm extrusion fixators to slide on the operation fixing seat so as to extrude and fix the diaphragm through the diaphragm at the inlet and outlet of the base; finally, a longitudinal and transverse stretching driver synchronously transversely and longitudinally stretches the diaphragms passing through the base and the longitudinal extrusion adjusting seat, after stretching and deflection, the longitudinal and transverse stretching driver is lifted up, then the two diaphragm extrusion fixators are lifted up, then the battery diaphragms are intermittently added, and the process is repeated. The lit