The invention discloses a charging device for a mobile communication terminal, which belongs to a charging device. The charging device includes: a power supply unit for supplying power from outside; a first batteries for supplying operation power; a second batteries for supplying charging power to the first batteries; a built-in charging device which supplies power to the first batteries or the second batteries based on a strength of current when power if supplied by the power supply unit. The invention has an effect that when supplying power to the batteries of the mobile communication terminal, the batteries power supply provided in the built-in charging device is charged according to the strength of the charging current of the batteries. As a result, it is not required to additionally charge the built-in charging device besides charging the batteries of the mobile communication terminal, thereby, the convenience for user is largely enhanced, and power can also be supplied to the batteries by the built-in charging device even power is not additionally connected when power is breaked, so that the charging efficiency of the mobile communication terminal is largely improved. |