Reserved inspection hole device for tunnel lining water seepage treatment

The utility model discloses a tunnel lining water seepage treatment reserved inspection hole device which comprises a semicircular drainage pipe installed on a tunnel lining, and an inspection device is installed in the semicircular drainage pipe. The inspection device comprises a dredging mechanism and an observation mechanism, the dredging mechanism comprises a water storage mechanism, a rotating mechanism, a water injection port and an auxiliary drainage groove, and the water injection port is communicated with the semicircular drainage pipe; the water storage mechanism comprises a plurality of rotating shafts mounted in the semicircular drainage pipe and reset springs mounted on the rotating shafts, one side of each rotating shaft is fixedly connected with a baffle, one end of each reset spring is fixedly connected with the corresponding rotating shaft, and the other end of each reset spring is fixedly connected with the corresponding baffle; the observation mechanism comprises an observation disc and arc