The utility model provides a presetting system adjustable choke, render to in advance set up in oil pipe preset the seating nipple in, include from last to connect gradually down move the accuse device, go up the casing, slips, slip spider, casing, disk seat down, go up and be equipped with the gas outlet on the casing, the disk seat overcoat is equipped with the packing element, the disk seat top is equipped with the valve rod, the valve rod upper end with move the accuse device and be connected, axial up -and -down motion can be followed under the device drive for conical head and valve rod moving to control to the valve rod lower extreme, it connects to move accuse device and last housing seal, move the accuse device and receive the instruction that the ground host computer sent, according to the instruction drive the valve rod axial upwards or the downstream to instructing appointed position. This presetting system adjustable choke is the reciprocal linear motion of flow nipple valve rod through the positive despinning conversion of motion with the motor, carries out real -time two -way reversible regulation to an aperture between disk seat and valve rod conical head, has realized pit shaft well head pressure accurate control and output and has regulated and control, has improved the ability that the pit shaft air current carried the hydrops.