The invention discloses an automatic winding method for a lithium battery pole piece. A square winding pin is mounted on a reel and is enabled to rotate at a constant speed to roll materials and form a heart-shaped track in a radial direction, so that the materials entering the square winding pin by winding are kept horizontal at any moment and are wound into the winding pin at a constant speed. According to the motion track provided by the invention, the problem of up-and-down fluctuation of the materials in a material winding process of a winding machine is favorably solved.