The geological surveying instrument comprises an RTK measuring
machine body, a supporting
assembly and a horizontal detection
assembly, the supporting
assembly is arranged at the bottom of the RTK measuring
machine body and comprises an
insertion rod arranged at the bottom of the RTK measuring
machine body, a positioning sleeve is arranged on the outer side of the
insertion rod in a sleeving mode, a locking part is arranged at the penetrating position of the
insertion rod and the positioning sleeve, and the horizontal detection assembly is arranged on the insertion rod. The horizontal detection assembly comprises a connecting block arranged on the side of the top of the positioning sleeve, a
spirit level is connected to the top of the connecting block in a penetrating mode, and a fixing part is arranged at the penetrating position of the
spirit level and the connecting block; the
spirit level is connected to the top of the connecting block in a penetrating mode, the fixing portion is arranged at the penetrating position of the spirit level and the connecting block, the spirit level and the connecting block are locked through the fixing portion, and compared with the mode that the spirit level is directly bonded with the connecting block through glue, the locking design of the fixing portion prevents the spirit level from being damaged after being used for a long time. The
adhesive part of the glue is loosened, so that the
water level falls off, and the use of the
water level is influenced.