Soil layer thickness measuring instrument for land surveying and mapping

The utility model discloses a soil layer thickness measuring instrument for land surveying and mapping, which relates to the technical field of land surveying and mapping, and comprises a mounting frame, a limiting plate arranged in the mounting frame in a sliding manner, a mounting rod arranged on the limiting plate, and a driving plate arranged at the top of the mounting rod; the measuring mechanism is arranged on one side of the limiting plate and comprises a rotating column rotationally arranged on the limiting plate in a penetrating mode, the rotating column below the limiting plate is fixedly connected with a spiral blade in a sleeving mode, limiting openings are formed in the limiting plate on the two sides of the rotating column, measuring cylinders are arranged in the limiting openings and are of an up-down penetrating structure, and measuring assemblies are arranged on the measuring cylinders; a driving assembly is arranged on the driving plate, positioning bases are arranged on the two sides of the