Abstract: Disclosed are a button battery and a manufacturing method therefor, the button battery includes an upper cover plate, a pole, an insulating sleeve, a bottom shell, a battery winding core and a sealing ball. The upper cover plate is provided with a liquid injection hole and a stepped through hole with a small upper portion and a large lower portion; upper and lower ends of the pole are respectively a cylindrical portion and a head portion; the insulating sleeve is sheathed on the pole that penetrates through the stepped through hole, the head and cylindrical portions correspond to lower and upper end of the stepped through hole respectively; the battery winding core is arranged in an inner cavity formed by the upper cover plate and the bottom shell; and the sealing ball is arranged on the upper cover plate and seals the liquid injection hole.