Quick airtight casing thread connector

The utility model discloses a quick airtight casing thread connector. The quick airtight casing thread connector comprises a coupling and two external thread connectors which are connected with the coupling respectively, the outer surface of each external thread connector is provided with taper pipe external threads which gradually contract from outside to inside, the inner surface of the coupling is provided with taper pipe internal threads matching with the taper pipe external threads, the taper pipe external threads and the taper pipe internal threads are both buttress threads, and the tooth height of the taper pipe external threads and the taper pipe internal threads is larger than that of an API (American Petroleum Institute) thread with the same outer diameter, the pitches are all 4 threads per inch, the tapers are all 1:16, the guide surface angles are all 30 degrees, and the bearing surface angles are all 1 degree. The quick airtight casing thread connector combines a quick thread and an airtight thread skillfully, and on the premise of facilitating processing, not only meets the usability requirements of the API standard, but also improves the screwing-on speed, the sealing performance and the thread-gluing-resistant performance; is a casing thread connector which is suitable for complex operating conditions; can be applied to high-pressure oil wells, medium-pressure gas wells and high-pressure gas wells; and is easy and convenient to operate, high in working efficiency and reliable in performance.