Foundation pit crack detection device for geotechnical engineering

The utility model discloses a geotechnical engineering foundation pit crack detection device which comprises an operation plate, a threaded hole is formed in the operation plate in a penetrating mode, a lead screw is movably connected to the interior of the operation plate, one end of the lead screw is fixedly connected with a clamping ring, the surface of the clamping ring is sleeved with a clamping ring, and the other end of the clamping ring is fixedly connected with a connecting rod. A detection device is arranged on the other side of the clamping ring; the position of the detection device can be adjusted by matching the motor, the screw rod and the clamping ring with the clamping ring, so that a worker does not need to hold a display screen and bend down to abut the detection device against the ground to be detected for detection during crack detection, and only the motor needs to be started to adjust the position of the detection device; the working intensity of workers is greatly reduced; the fixing bl