A highway entrance detecting control system comprises a PLC controller, an automatic card dispensing motorcycle lane automatic monitoring control unit, an ETC lane automatic monitoring control unit, and a green channel specialized lane automatic monitoring control unit. The automatic card dispensing motorcycle lane automatic monitoring control unit is composed of a height limiting detecting mechanism, a width limiting detecting mechanism, a length limiting detecting mechanism, a remote information receiver, a digital alarm, an electric guardrail and a sound-and-light alarm. The ETC lane automatic monitoring control unit is composed of height measuring equipment, an electric guardrail and a sound-and-light alarm. The green channel specialized lane automatic monitoring control unit comprisesheight measuring equipment and a sound-and-light alarm. According to the highway entrance detecting control system, through integrating various photoelectric detections and highway control, mechanization and automation in highway entrance controlling are realized, and highway safety management efficiency is improved. The highway entrance detecting control system has advantages of simple structure, high automation degree, high operation stability, and accurate and reliable detection.