Crash auto-restart method and mobile phone

The invention discloses a crash auto-restart method and a mobile phone. The method comprises the following steps that: a base band and radio-frequency amplification module outputs a watchdog clearing signal to hardware watchdog; the hardware watchdog outputs a reset signal to an enabling end of a power analog switch when the hardware watchdog does not receive a watchdog clearing signal within a certain period of time; and the enabling end of the power analog switch receives the reset signal which is output by the hardware watchdog to restart the mobile phone automatically. The crash auto-restart method and the mobile phone can improve customer satisfaction, improve market competiveness of the product and save implicit cost.