The invention discloses a vehicle-mounted Internet intelligent control system and a control method thereof and relates to the technical field of electric automobile vehicle-mounted Internet. The vehicle-mounted Internet intelligent control system is provided with an electric automobile double-circuit power supply system. A battery can be maintained, self-checked and evaluated. The vehicle-mounted Internet intelligent control system comprises the battery, a first switch, a second switch, a power management module, a low-voltage load, a first node, a second node, a third node, a key switch module, a vehicle control module and a third switch. One end of the first switch, one end of the second switch and the anode end of the battery are connected to the first node. The other end of the second switch, the other end of the third switch, the power interface anode end of the power management module and the power interface anode end of the low-voltage load are all connected to the second node. The cathode end of the battery, the power interface cathode end of the power management module, the power interface cathode end of the low-voltage load and the power interface cathode end of the vehicle control module are all connected to the third node.