The invention relates to the field of construction monitoring systems, in particular to a secondary lining belt mold grouting monitoring system. The system is used for monitoring the concrete pouringprocess of a tunnel lining trolley, the trolley is provided with a working window, and the secondary lining mold grouting monitoring system comprises a main camera, a monitoring device and a fixing device; the main camera is connected with the monitoring device, and the monitoring device is used for displaying images captured by the main camera; the main camera is connected to the fixing device, and the fixing device is connected to the trolley; the main camera can cooperate with the working window on the trolley. Through the secondary lining belt mold grouting monitoring system, during the construction process, the images captured by the main camera through the working window are transmitted to the monitoring device, and construction personnel can monitor the construction condition in theworking window through the monitoring device, thereby achieving real-time monitoring of the secondary lining belt mold grouting process.