The utility model relates to a needle winding mechanism for a battery winding machine. The needle winding mechanism comprises a needle seat, a needle winding assembly and a needle winding receiving seat, wherein two ends of the needle winding assembly are respectively inserted into the needle seat and the needle winding receiving seat, and the free end of the needle winding assembly is movably fixed by the needle winding receiving seat; the needle winding assembly comprises a first outer winding needle, a second winding needle, a first inner winding needle and a second inner winding needle; the needle seat comprises a shaft handle, a needle seat body and a slide block which are connected to a winding shaft of the battery winding machine, the slide block is transversely mounted in the needle seat body in a sliding manner, and a transverse movement control device for controlling the slide block to do transverse reciprocating motion is arranged on the needle seat body; and the fixed ends of both the first outer winding needle and the first inner winding needle are arranged on the needle seat body of the needle seat, the fixed ends of both the second inner winding needle and the second outer winding needle are arranged on the slide block in the needle seat body, and the transverse movement control device controls the slide block to transversely move to drive the second inner winding needle and the second outer winding needle to move close to or away from the first outer winding needle and the first inner winding needle to clamp or release a membrane penetrating between the first inner winding needle and the second inner winding needle.