Surveying instrument positioning device for engineering surveying and mapping

A surveying instrument positioning device for engineering surveying is characterized in that three supporting legs are uniformly hinged to the bottom of a mounting plate, a test ball is hung at the bottom of the mounting plate, a bottom plate is rotatably connected to the upper end of the mounting plate, a plurality of rib plates are fixedly connected to the circumferential surface of the bottom plate, and a mounting block is arranged among the rib plates; the lower side of the mounting block is of a hemispherical structure, and a plurality of horizontal pipes are uniformly and fixedly connected to the surface of the mounting block; when the device is used, the position of the tester can be adjusted through twice adjustment, so that the accuracy of the tester during use is effectively improved; when the device is placed, the horizontal position of the mounting plate can be adjusted according to the position of the test ball, so that the mounting plate can be kept parallel to the ground when the device is plac