Hydraulic expansion type tail pipe hanger

The invention relates to a hydraulic expansion type tail pipe hanger, which comprises that: a drill stem thread at the upper end of a release sub is in threaded connection with a drill string; an internal thread at the lower end of the release sub is in threaded connection with a central pipe; an expansion cone is sleeved outside the central pipe, connected with a shear pin B and a float valve sleeve and freely slides on the central pipe; and the expansion cone and an expansion pipe realize motive seal fitting with the central pipe by a plurality of sealing rubber rings. The hanger is characterized in that a thread at the lower end of the central pipe is in threaded connection with the float valve sleeve; and the float valve sleeve is provided with a hinge mount, a hinge, a shifting fork, a valve cap and a spring. The hanger has the advantages of simple structure, convenient operation, high hanging success rate and good sealing quality. After a tail pipe is hung, the inner drift diameter of a pipe column is large, which is convenient for later drilling work. The hanger has obvious application advantages in ultra deep wells and horizontal wells with large displacement.