The utility model relates to a gas well prearranging type underground restrictor for high-pressure natural gas to throttle and controlling press for a well barrel, which comprises a working barrel 5, and core combination composed of a lock block axle 1, a locating ring 2, a lock block 3, a lock block body 4, a V-shaped sealing ring 7, a throttling nozzle 8, etc. The working barrel 5 is connected to a prearranged position on a production oil pipe. After a core is delivered into the presetting working barrel by a special delivery tool, the core combination adopts a steel cable to downwards strike the core, and the lock block 3 enters into an inner slot of the working barrel 5, so as to complete the delivery of a restrictor. The lower end of the lock block body 4 is provided with an outer sealing ring 7 which is sealed with the oil pipe, and the bottom part is provided with the throttling nozzle 8. The structure can take out the core without resistance at refloatation time, and the throttling nozzle can be conveniently replaced and debugged on site.