The invention provides a connecting end forming method and a device thereof. The device is a connecting end forming device in an electrode slice manufacturing device (100) with a connecting end, and the electrode slice manufacturing device (100) with the connecting end is used for enabling a coiled material (1) with an electrode part (1a) and an ear part (1b) to move in the same direction. The device is characterized by comprising a laser ejector (50), an ear cutting part (70) and an ear recovery part (80); and the laser ejector (50) is used for forming the connecting end, irradiating a laserbeam (L1) according to the moving ear part (1b) and cutting the connecting end (5) which is connected with the electrode part (1a), the ear cutting part (70) is arranged in a position which is higheror lower than the moving surface of the electrode part (1a) at an irradiation point (Pm) before the connecting end is cut off downstream the irradiation point (Pm) of the laser beam (L1), a drawing angle (alpha) is generated between the ear cutting part (70) and the moving surface of the electrode part (1a), and the ear recovery part (80) is used for applying tension to a broken material, which iscut by the laser beam (L1), of the ear part (1b) of the connecting end (5) and recycling the broken material in the step with the movement of the coiled material (1).