Mounting and supporting device for civil construction foundation pit

The utility model relates to the technical field of civil engineering construction, and discloses a civil engineering construction foundation pit mounting and supporting device which comprises a device base and a mounting plate, a pushing mechanism is arranged on the inner wall of the device base, and the pushing mechanism comprises a fixing plate, a driving motor, a threaded rod, a fixing guide rail and a moving block. The bottom of the fixing plate is fixedly connected with the bottom of the inner wall of the device base. According to the mounting and supporting device for the civil construction foundation pit, the problems that in the actual use process, the height of the device cannot be effectively adjusted according to different depths of the foundation pit, so that the device more effectively supports the inner wall of the foundation pit, and the practicability of the device is low are effectively solved; in the whole operation process, lifting control is conducted on the connecting arm rod, so that a