The invention relates to a purely-mechanical self-adaptive battery replacing device comprising a battery lifting platform, the upper side of the battery lifting platform is provided with several probe supporting rods, the bottom side of the battery lifting platform is fixed on one end of a battery lifting platform forked support, the other end of the battery lifting platform forked support is fixed to a battery lifting platform base plate, the bottom side of the battery lifting platform base plate is fixed on a drum type entity through a first spring, and projections at two sides of the battery lifting platform base plate are fixed with a spherical hinge lower cover plate. By employing the purely-mechanical self-adaptive battery replacing device, positioning by means of software operation is avoided, used sensors are reduced, and therefore the cost is effectively reduced; when being used, the purely-mechanical self-adaptive battery replacing device does not need to be positioned accurately, and can automatically adjust during the uprising process; and the purely-mechanical self-adaptive battery replacing device is simple in structure, the cost is saved, and the battery can be replaced quickly. The purely-mechanical self-adaptive battery replacing device is suitable for being widely popularized and used, and has obvious advantages.