The invention provides a liquid gravitational potential energy movement organ, which is a novel power machine, converts liquid gravitational potential energy into kinetic energy according to the energy conservation law, and generates no pollution and noise and does not consume fuels and electric energy in a conversion process. The liquid gravitational potential energy movement organ adopts an operating principle that: an object immersed in a liquid can float and then the object can obtain energy. The liquid gravitational potential energy movement organ can be used for generating electricity and driving vehicles and boats to move.