The invention provides an underground cavern deformation measurement positioning and warning device, which comprises a protective cover, a hooking ring, a pedestal and a penetrating cone, wherein the lower part of the inner side of the protective cover is provided with protective cover threads, the outer side of the protective cover is painted with a fluorescent warning layer, the outer side of the protective cover is further provided with a pressure sensor, an alarm and a power supply, the power supply is connected with the pressure sensor and the alarm, the pressure sensor is connected with the alarm, the bottom part of the pedestal is connected with the penetrating cone, the penetrating cone comprises a cone bar and a penetrating cone tip, pulling-resistant grooves are formed in the cone bar at intervals, the top part of the pedestal is provided with a pedestal platform threaded ring, the pedestal, the pedestal platform threaded ring and the penetrating cone are coaxially arranged, the pedestal platform threaded ring is matched with the protective cover threads, and the center of the top part of the pedestal is provided with the hooking ring. The underground cavern deformation measurement positioning and warning device has the advantages of simple structure, easy manufacturing, obvious warning function, long service life, high fixing force and good pulling-resistant effect, can be kept for a long time once the construction is implemented, is conductive to improve positioning precision and effectiveness, and is used for positioning measurement basis points.