Laser surveying instrument

The utility model discloses a laser surveying instrument, which comprises a range finder main body and a protective shell, one end of the range finder main body is fixedly connected with the protective shell, one end of the protective shell is fixedly connected with a connecting shell, and the inner side of the connecting shell is provided with a fixed shell. The fixing shell and the connecting shell are attached to the wall, meanwhile, the inner shell is moved out of the inner side of the fixing shell under the action of the second spring, the inner shell is moved to one side of the range finder body, and then the distance between the inner shell and the other wall can be measured through the range finder. And then the sum of the measured distance and the thickness of the inner shell is the distance between the two walls, so that the problem that when the distance between the measured walls is smaller than the length of a laser range finder, the laser range finder cannot be placed between the measured walls,