The invention provides a paper feeding device for diaphragm paper for batteries. The paper feeding device comprises an adsorption block which is provided with an upper air absorbing pipe and a lower air absorbing pipe. The upper air absorbing pipe adsorbs upper roll paper. The lower air absorbing pipe adsorbs lower roll paper. An upper paper cutting air cylinder and a lower paper cutting air cylinder are arranged on one side of the adsorption block. An upper paper cutting knife is connected to one end of a telescopic rod of the upper paper cutting air cylinder. A lower paper cutting knife is connected to one end of a telescopic rod of the lower paper cutting air cylinder. An ironing connection pad is arranged on one side of the upper paper cutting air cylinder, and an ironing connection pad is arranged on one side of the lower paper cutting air cylinder. An ironing connection air cylinder is arranged above each ironing connection pad. An ironing head is arranged below each ironing connection air cylinder. The paper feeding device is simple in structure, reasonable and novel in design, convenient to operate and capable of effectively completing continuous feeding of the diaphragm paper.