The invention relates to the technical field of offshore platform construction, in particular to a pile leg hoisting method using a secondary lever principle. According to the hoisting method, pile legs are always in a vertical state during hoisting and have good balance, and the height of a hoisting workpiece is higher than a gantry crane beam. Besides, by the adoption of the pile leg hoisting method, the pile legs are mounted in the slipway stage in advance, marine installation required after a platform is the sea is avoided, the mounting accuracy is improved, and the mounting difficulty islowered greatly; and existing crane resources are adopted completely, leasing of large crane equipment is avoided, the rental cost is saved, and the ship construction cost is reduced greatly.