The invention discloses a balanced charging device applied to a lithium battery. Two sets of charging mechanisms are used to realizing balancing of charging. The charging device and control method thereof have the advantages that the problem in heat management does not exist compared with dissipation type balancing; the balancing current is heavy, the efficiency is high and the speed is high compared with capacitive or inductive energy storage non-dissipation balancing; and compared with balancing via a transformer, a magnetic core and a coil are not needed, there is no magnetic leakage, and the volume is controllable.