A control system of a narrowly defined intelligent signal lamp is composed of a main control computer (1), a digital wireless broadcast transmitting station (2) and the intelligent signal lamp (3), wherein the main control computer (1) establishes an intelligent signal lamp scheme automatically. The main control computer (1) is composed of a main control circuit, a storage device, an input/ output interface, a display screen, a main case and software, wherein the storage device, the input/ output interface and the display screen are connected with the main control circuit. The intelligent signal lamp is composed of a main control circuit, a storage device, an input/output interface, software and a traffic signal light (5). The intelligent signal lamp contains a digital wireless radio broadcast receiving device and a signal lamp command detection module, and is used for changing the display status of the traffic signal light (5) as agreed through a signal lamp command of the detection nodule. The intelligent signal lamp (3) is connected with the main control computer (1) through the digital wireless broadcast transmitting station (2).