The invention discloses a signal lamp control system capable of regulating display shapes. The signal lamp control system comprises a central controller, an upper computer, a vehicle flow rate detection module, a display control module and a signal lamp, wherein the central controller is respectively connected with the upper computer, the vehicle flow rate detection module and the display control module; the signal lamp is connected with the display control module; and the display control module comprises a first controllable switch and a second controllable switch, wherein the first controllable switch is connected with a first output terminal of the central controller, and the second controllable switch is connected with a second output terminal of the central controller. According to the invention, because the signal lamp is controlled to display different shapes at different times, the use of traffic signal lamps can be standardized, the traffic consciousness of traffic participants can be improved, the complexity of receiving information by the traffic participants can be reduced, the intersection passing efficiency can be improved, the traffic safety can be enhanced, and the cost of installing traffic signal equipment can be lowered.