The invention provides a tubing coupling with high corrosion resistance and high leakage resistance, which comprises a coupling, a sealing ring and an orifice sealing ring, wherein the sealing ring is mounted in the middle of the inner wall of the coupling, the sealing ring is positioned on the coupling through a positioning step, the sealing ring is in close fit with a tubing entering into the coupling, the contact surface between the sealing ring and the tubing is a circular arc which is in inosculation with a tube head of the tubing, and the inner diameter of the sealing ring is larger than or equivalent to that of the tubing; and the orifice sealing ring is mounted on the inner wall of the coupling, which is near to a port, and the inner diameter of the orifice sealing ring is smaller than that of the tubing. The tubing coupling can well protect the threaded joint of the anti-corrosion tubing coupling, simultaneously increase the sealing performance at the joint between the coupling and the tubing, meet the use of the anti-corrosion tubing produced according to the requirements of SY/T6717-2008 technical conditions of coatings in tubings and sleeves, play the roles in high leakage resistance and high corrosion resistance, prolong the service life of the tubing and the coupling and save oil production cost.