Mobile phone without power failure

The utility model discloses a mobile phone without power failure, a mobile phone baseband chip serves as a main control chip for running control logic, a power supply switching circuit is controlled through a GPIO port, and the power supply for the mobile phone by external double barriers, a built-in battery and a charger is realized. The independent running of a power supply monitoring circuit can prevent over-discharging of the batteries, be responsible for controlling the power supply switching circuit before starting the mobile phone, and ensure the reliable starting voltage. The mobile phone can use different power supplies for power supply by considering various situations of a mobile phone power supply system, switch among the different power supplies for avoiding the power failure, avoid the need of manual operation of a user, achieve the purpose of avoiding the power failure for ever in the real sense and further upgrade the mobile phone standby function to the maximum extent.