The invention provides a LED automatic control system which includes an upper computer, the upper computer belongs to a computer hardware equipment which is installed with an intelligent system control software in inner. The upper computer communicates with a control host by way of electrical power carrier, the control host is installed in a distribution cabinet, the control host connects with a series communication interface of the electrical power carrier router, the electrical power carrier router is jointed to the electrical power carrier channel of each branch computer through the electrical power line, each electrical power carrier channel connects with the control module with electrical power source through the series communication interface, the electrical power source control module connects with the LED router electrical power source. The control system can process category setting according with grade and characteristic of the road for controlling the road lamp opening or closing automatically. The system also can adjust the lamp brightness and working power, and monitor using condition of the road lamp and the line in time, the system also can jump the control system and control the road lamp switch by hand.