The invention discloses a power supply management method and device of a vehicle-mounted intelligent device and a readable storage medium. The power supply management method of the vehicle-mounted intelligent device comprises the steps that when a vehicle is detected to be in a flameout state, a network of the vehicle-mounted intelligent device is disconnected, and a first set resource module of the vehicle-mounted intelligent device is turned off, so that the vehicle-mounted intelligent device enters a deep sleep mode; the vehicle-mounted intelligent device is periodically woken up by periodically sending a waking up instruction to the vehicle-mounted intelligent device through a reserved waking up interface; and the vehicle-mounted intelligent device is controlled to acquire vehicle state information of the vehicle after being woken up, and the vehicle state information is reported to a cloud platform. According to the method and device and the storage medium, the scheme can reduce the energy consumption of the vehicle-mounted intelligent device.