This article proposes a design scheme for an automatic battery swapping station for electric vehicles. The automatic battery swapping station mainly includes a cyclic battery pack storage device, a battery pack storage compartment, a swapping platform and so on. The cyclic battery pack storage device has a battery life processor, and the battery pack storage compartment reads the usage curve data of each battery through an interface. The battery life processor collects data on the temperature and current of the battery during electric vehicle driving and establishes a capacity degradation model for non-linear Wiener processes. It calculates the lifespan of the battery pack, sorts the batteries, sets the priority of each battery, and ultimately places the battery with the highest priority at the top of the battery swap queue. The swapping platform can automatically disassemble and assemble the battery pack when it reaches the designated position. The automatic battery-swapping station can lift and stack the battery packs without complex lifting mechanisms, making the swapping process simple, the battery pack exchange time short, and the swapping efficiency high.