The utility model discloses a building surveying and mapping device based on BIM. Surveying and mapping instrument base, outer sleeves are uniformly hinged to the edge of the bottom of the surveying instrument base; the surveying and mapping instrument comprises a surveying and mapping instrument base, a lead screw base is installed in the middle of the bottom of the surveying and mapping instrument base, a lead screw is arranged at the bottom of the lead screw base, a lead screw sleeve matched with the lead screw is arranged on the outer side of the lead screw, a rotating block is installed at the bottom of the lead screw, and hinge rods are evenly hinged to the outer side of the lead screw sleeve. The device is provided with supporting legs, an outer sleeve, a limiting ring, a locking hole, a sliding groove and a limiting bulge, when the device is not used, the device is started; the limiting blocks are pulled outwards to move the sliding blocks to the bottommost portion of the outersleeve, the limiting blocks are loosened to complete locking, then the supporting legs are folded into the outer sleeve, the rotating blocks are turned over to enable the lead screws to drive the lead screw sleeves to move downwards, and therefore the outer sleeve is pulled to be folded inwards through the hinge rods, the occupied space of the device is reduced, carrying and storage are convenient, and the applicability of the device is improved.