To provide a new energy converting method, a new energy generating engine, and a new energy producing device.

A floating tank 1 is disposed in a dynamic tank 3, a space is provided over the water level of the watered dynamic tank 3, and the floating tank 1 suspended in the space is dropped to supply an energy to the outside while increasing a self-internal energy by the energy by the fall. The dropped floating tank 1 is dipped into water by raising the dynamic tank 3, the floating tank 1 is raised by buoyancy, and while increasing the self-internal energy, and the floating tank supplies an energy to the outside. When the floating tank 1 reaches an upper limit, the dynamic tank 3 falls automatically, stores water in the dynamic tank 3, and forms a space over the water level. The floating tank 1 is dropped again to repeat the action.