Surveying instrument stable supporting device for engineering surveying and mapping

The invention discloses a surveying instrument stable supporting device for engineering surveying and mapping. The supporting device comprises a supporting box, a supporting mechanism and a positioning assembly. A fixedly-connected partition plate is installed at the middle end of an inner cavity of the supporting box, fixedly-connected electric telescopic rods are installed on the left side and the right side of the top of the partition plate correspondingly, a fixedly-connected movable plate is installed at the output ends of the electric telescopic rods, and a fixedly-connected containing box is installed at the top of the movable plate. The screw rod drives the screw sleeve to move downwards under the action of threads in the rotating process, the screw sleeve pushes the guide plates on the periphery to the outer side through transmission of the transmission rod, at the moment, the bottom of the non-slip mat makes contact with the surrounding ground, the non-slip mat forms a cross-shaped structure on the