The utility model discloses a lead head structure of a battery terminal. The lead head structure comprises the battery terminal protruding out of a battery, a lead electrically connected with the battery terminal, as well as a protective cover, wherein the protective cover is provided with a hollow inner cavity and the bottom end of the protective cover is tightly connected with battery; the inner cavity is internally provided with a connector; one end of the connector is connected with the battery terminal, and the other end thereof is connected with the lead. In the utility model, only the protective cover with simple structure and low production cost is added at the joint of the battery terminal and the lead, thus isolating the battery terminal and the lead which are electrically connected with each other from the outside, effectively avoiding the corrosion of the terminal and prolonging the service life of the battery; and simultaneously, the protective cover is internally provided with one replaceable connector, therefore, the lead head structure can be directly installed with the existing batteries having different terminal structures, without developing batteries additionally; and the lead head structure has strong universality and saves processing cost.