A dynamic distribution device for a battery power loop is provided. The dynamic distribution device comprises a voltage sensing module, a power management logic, a power switch circuit, a buck loop and a boost loop. The voltage-sensing module is electrically connected to a battery and is adopted for sensing a battery voltage of the battery. The power managing logic is electrically connected to the voltage-sensing module and is adopted for receiving a sensing result from the voltage-sensing module. The power switch circuit is electrically connected to the power managing logic and is adopted for operating correspondingly to a control command from the power managing logic. The buck loop is electrically connected to the power switch circuit and is adopted for lowering inputted voltage. The boost loop is electrically connected to the power switch circuit and is adopted for raising inputted voltage.