The utility model relates to the field of storage battery manufacturing. A base is provided with a groove with an upward opening, the groove is used for containing a to-be-cut acid adding kettle, a cutter holder of a fodder chopper is fixed to the base and abuts against one side of the groove, one end of a cutter of the fodder chopper is rotationally connected to one end of the cutter holder, andthe other end of the cutter of the fodder chopper is rotationally connected to the bottom end of a telescopic rod of a cutting air cylinder; a telescopic rod of the pressing air cylinder is verticallydownwards arranged right opposite to the groove, and a pressing plate is fixed to the bottom of the telescopic rod of the pressing air cylinder. The cutting air cylinder, the fodder chopper and the pressing air cylinder are all fixed to the machine frame, a base of the machine frame is in sliding connection with the base through a guide rail perpendicular to the knife holder, and the side wall ofone side of the base of the machine frame is further in threaded connection with a locking screw perpendicular to the guide rail in a penetrating mode. And when the acid adding kettle to be cut is arranged in the groove, the acid leading sheet is horizontally arranged on the upper surface of the cutter holder. When the device is used for cutting, a to-be-cut acid adding kettle can be well positioned, the cutting length of the acid leading sheet can be adjusted, and a cut is flat and smooth after cutting.