The invention discloses a bridge flexibility monitoring system based on the visible light imaging technology. The invention discloses a bridge flexibility monitoring system based on the visible light imaging technology, which is characterized by using a central data processing module to cooperatively work with a display module, an information transmission module, a data transmission module and a CCD flexibility monitoring module, using the non-contact monitoring mode, using the light as monitoring medium and using the CCD flexibility monitoring module which consists of a first stage processor, a CCD flexibility monitor, a CCD area array detector, an LED light source, an optical emission device, an optical reception device and a target to monitor whether the change of the flexibility value exceeds the flexibility limit. The invention replaces the laser with the visible light as a transmission medium, reflects change of flexibility of the bridge through the target reflection light spot displacement, does not need the complex operation, obtains the data change only through the image, and greatly reduces the system cost.