Portable expansion and contraction laser tester

The utility model discloses a portable expansion and shrinkage laser tester which comprises an expansion and shrinkage laser tester body, a bottom plate is arranged at the top of the expansion and shrinkage laser tester body, a sliding groove is formed in the top face of the bottom plate, a sliding seat connected with the sliding groove in a sliding mode is arranged on the sliding groove, screw rods are rotationally connected to the inner walls of the two sides of the sliding groove, and the screw rods are arranged on the bottom plate. The screw rod is in threaded connection with the sliding seat; the expansion and contraction laser tester has the beneficial effects that when the whole expansion and contraction laser tester is carried and transported, the lifting device moves downwards to be stored in the sleeve, the overall length of the lifting device and the sleeve can be reduced, the sliding seat slides to enable the sleeve to be located on one side, then the vertically-placed sleeve swings to be attached