Green manufacturing is part of the continuous improvement strategy and green energy is indispensable to carry out green manufacturing because manufacturing is energy intensive. Green energy manufacturing is not easy to carry out with conventional means, but with the introduction of nanotechnology, many technical bottlenecks of green energy manufacturing can be resolved. This paper discussed the applications of nanotechnology in green energy manufacturing, especially in the manufacturing of several typical green energy such as solar energy, nuclear energy, biomass energy and geothermal energy, and then pointed out that nanotechnology was helpful to eliminate the technical bottlenecks of green energy manufacturing. Finally, with looking forward to the future, conclusion was drown that by the use of nanotechnology in green energy manufacturing, the supply of green energy would go up to a great new level and the green energy manufacturing would get remarkable progress.