High-torque-resistance and high-metal self-sealing screwed joint structure of oil casing

The invention belongs to the technical field of oil exploitation pipes, and particularly relates to an oil casing high-torque-resistance and high-metal self-sealing screwed joint structure which comprises a coupling and a pipe body, and the inner side of the coupling is sequentially provided with an internal thread, a tool withdrawal groove, a coupling sealing conical surface and an anti-torque shoulder in the axis direction. An external thread, a transition conical surface and a pipe body sealing conical surface are sequentially arranged on the outer side of the pipe body in the axis direction, a pipe body anti-torque end face is arranged at the end of the pipe body, a pipe end inner flat is arranged on the inner side of the pipe body, and after the coupling is in threaded connection with the pipe body, the coupling sealing conical surface is in metal interference contact with the pipe body sealing conical surface. The anti-torque shoulder is in metal interference contact with the anti-torque end face of the