Preset underground high pressure throttle

The utility model relates to a preset underground high pressure throttle belonging to an underground gas production tool set of gas fields. The throttle comprises an outer sleeve (1), a fishing head (2), a central tube (9), a spare cap (5) and a lower joint (14). A seal housing main body (11) is arranged on an integral shaft consisting of the fishing head (2) and the central tube (9), a deblocking shear pin (3) is arranged between the fishing head (2) and a pawl spring (8), and a release shear pin (4) is arranged at the right side of the deblocking shear pin (3). The pawl spring (8) is externally connected with an elastic spring (7) by the spare cap (5). A support sleeve (10) and a rubber cylinder (12) are arranged outside the seal housing main body (11), and the seal housing main body (11) is in seal connection with the outer sleeve (1) by a seal ring. A nozzle (13) is arranged in an inner hole at the upper end of the lower joint (14), a locking spring (6) is arranged at the connecting part of the pawl spring (8) with the spare cap (5), and the pawl spring (8) is in thread connection with the spare cap (5). The utility model has the advantages of large contact area, strong ejection resistance capability, long seal time and no damage to oil pipes.