The invention discloses an OTEC (ocean thermal energy conversion) generating set comprising a support disposed in sea water. A driving wheel and a driven wheel which rotate in sync are disposed at the top of the support. A first roller is mounted at the bottom of the support. A second roller and a third roller are disposed below the driving wheel and the driven wheel respectively. A two-way shape memory alloy spring is wound on the driving wheel, the driven wheel, the first roller, the second roller and the third roller. The OTEC generating set further comprises a generator driven by the driving wheel. The shape memory alloys have different shapes under different ambient temperatures, vertical heat of sea water is converted into kinetic energy for the generator, and ocean thermal energy is developed and utilized.