The utility model discloses an underground restrictor. The underground restrictor comprises a releasing connector, a central pipe, a first shearing pin, a locking pipe, an oil nozzle, an oil nozzle cap, a body, an elastic clamping jaw, a slip base, a slip, an upper rubber cylinder, an upper cone body, a lower rubber cylinder, a lower cone body, an elastic hoop, a second shearing pin and a balancing mechanism. According to the underground restrictor, through holes which are formed in the lateral walls of the central pipe, the body and the lower cone body, a first packing which is arranged between the central pipe and the body, a second packing which is formed between the body and the upper cone body and a third packing which is arranged between the locking pipe and the body form into the balancing mechanism, the through holes are mutually communicated, the first packing can seal the through hole in the body when covers the through hole in the body and throttling and a large circulating channel is provided for natural gas below the underground restrictor, the working cycle of the restrictor can be shortened, the gas production efficiency is improved, and the production costs are reduced.