The invention relates to an Internet-of-Vehicles terminal power control method. A power management module is arranged in an Internet-of-Vehicles terminal to take charge of power-on, power-off, dormancy and awakening functions of vehicle-mounted functional modules, and a reliable and low-energy-consumption voltage logic operation control strategy is provided for a whole system. The control strategyincludes three working states which are the full working mode, a low power consumption mode and an ultra-low power consumption mode. After the system is powered on, the power management module adoptsa full power-on mode to start all the vehicle-mounted functional modules and enters in a Normal mode, and a state machine monitors the working state of the system in real time; after an active dormancy signal is received, the system enters in a front / transitional state, the related functional modules are sequentially stopped according to a set sequence, after all dormancy conditions are met, thesystem enters in the low power consumption dormancy state, and an overtime detection program is started; and after the current working state meets the ultra-low power consumption dormancy condition, the system enters in the ultra-low power consumption dormancy mode, and a deep electricity saving requirement is met.