A power-generating apparatus including an autocontrol electronic mechanical unit, a power-generating unit, a power transportation device, a liquid supply device, a shift device, and a discharge device. The power-generating unit includes a pair of interactive and coupled reverse-linked, hollow movement bodies. The relationship between the two movement bodies can be changed through filling liquid to one movement body or discharging liquid from the other. The movement body filled with liquid goes down and brings the other movement body without liquid up to generate power in cycle continuously utilizing lifting and drop movements of the two movement bodies. The power-generating apparatus can utilize objects' gravitational potential energy to generate power in cycle uninterruptedly so as to ensure the continuity and stability of power generation. The power-generating apparatus completely uses the ambient natural energy during its entire power generation process.