Disclosed is a battery swapping control system and a control method therefor. The battery swapping system comprises a control unit and a battery swapping device, wherein the control unit is used for determining a battery model applicable to an electric vehicle, and selecting a first battery placing rack and a second battery placing rack from at least one battery placing rack; and the battery swapping device serves to move to a preset battery swapping position, removes a battery with a power shortage from the electric vehicle, transports the battery with the power shortage to the second placing rack and places it in an unoccupied battery placing compartment, then moves to the first battery placing rack and removes a battery of that battery model, and transports the battery of that battery model to the preset battery swapping position and installs the battery in the electric vehicle.