The invention discloses a sensor monitoring and detection system used on an automatic rail weighbridge. The sensor monitoring and detection system comprises a sensor bridge, at least one sensor and a digital signal display device, wherein the at least one sensor is connected with the sensor bridge through a respective bridge lightning-proof unit; the at least one sensor is connected with the digital signal display device through a respective signal lightning-proof unit; and the digital signal display device is provided with a sensor signal input terminal and a corresponding sensor signal output terminal. Since the sensor monitoring and detection system used on the automatic rail weighbridge is used, the operation in an installation and debugging or maintenance and debugging process of the sensor is relatively simple, the accuracy of the installation and debugging or the maintenance and debugging of the sensor is improved, and in addition, the sensor monitoring and detection system has a lightning-proof function.