A liquid potential energy increasing device includes a first receiving trough, a second receiving trough, a liquid absorbing structure, a first magnetic component, and a second magnetic component. The liquid absorbing structure includes a main body portion and an extending portion. The extending portion conveys a liquid in the first receiving trough into the main body portion. When a sum of a weight of the main body portion and a weight of the liquid in the main body portion is greater than the magnetic attraction, the main body portion hits the second receiving trough by gravity, so that the liquid in the main body portion is at least partially released to the second receiving trough so as to increase potential energy of the liquid.