Abstract: This disclosure relates to a turbine generator set, in which an axial-flow turbine and a generator are embedded inside a flow channel. In an exemplary embodiment of the disclosure, the turbine generator set comprises: a flow channel being provided with a front end as an inlet duct and a back end as an outlet duct; an axial-flow turbine, being single-stage or multi-stage, capable of transforming thermal and pressure energies of a working fluid inside the flow channel into rotational energy; and a generator, comprising a rotor and a stator, being capable of transforming the rotational energy into electricity. A shaft of the turbine and a shaft of the generator can be coupled directly or by way of a gear set. Electricity is transmitted from the flow channel by way of a bunch of cables passing through the flow channel.