The invention discloses a mobile communication terminal and a double-battery charge and power supply switching method thereof. The main board of the terminal is provided with two battery interfaces and a charge and power supply circuit connected with the two battery interfaces. After the start-up of the terminal, the switching method comprises the following steps that: S1, a battery A supplies power, a battery B is idle and the voltages of the two batteries are recorded; S2, when the voltage of the battery A fails to meet power supply conditions, whether a charger is plugged in is judged; S3,when the charger is plugged in, the battery A supplies power while being charged, and the battery B is still keep idle; S4, when the battery A is fully charged and the battery B is undercharged, the battery A supplies power and the battery B is charged; and S5, when both the batteries are fully charged, the step S1 is returned to. The mobile communication terminal uses double batteries for charge and power supply, thereby meeting requirements on large capacity of mobile phone batteries. In addition, immediate switching is performed to allow another battery to supply power to ensure the continuity of the power supply of a mobile phone in case of accidents, for example, a battery is removed and software receives interruption sent by the system.