Terrain surveying and mapping device for building engineering design

The utility model discloses a topographic surveying and mapping device for constructional engineering design, which comprises a top plate, a supporting assembly is mounted at the bottom of the top plate, a lifting rod capable of moving vertically is mounted at the top of the top plate, a mounting plate is fixed at the top end of the lifting rod, and a measuring instrument is mounted at the top of the mounting plate. Two protective shells are slidably mounted at the top of the top plate, sliding blocks are vertically slidably mounted on the inner side walls of the two protective shells, two swing rods are rotatably mounted on the outer wall of the lifting rod, and the ends, away from the lifting rod, of the two swing rods are rotatably mounted on the outer walls of the two sliding blocks correspondingly. Through cooperation of structures, when the lifting rod ascends, the measuring instrument can be taken out of the protective shell, meanwhile, the supporting legs are unfolded, erecting and using are convenien