A mobile communication terminal having a malfunction-preventing function is provided, including a keypad; a voltage source which is activated by voltage supplied to an EN terminal, processes voltage supplied from a battery, and outputs the processed voltage; a power_on switching unit switched on when a switch_on key of the keypad is pressed; a charging terminal supplying voltage supplied upon charging to the EN terminal; a malfunction-preventing unit preventing voltage from being supplied from the charging terminal to the EN terminal while a control signal is input; and a controller which is activated by voltage supplied from the voltage source during a power-off condition, controls the mobile communication terminal by supplying voltage to the EN terminal of the voltage source and receiving voltage from the voltage source, and outputs a control signal to the malfunction-preventing unit only when a power-off process is performed according to a power-off instruction from the keypad.