A water tank structure with wireless power transmission devices is disclosed. The water tank structure includes a water tank, a passive device, and a transmitter. The passive device is disposed in the water tank and includes a receiver. The transmitter transmits electric energy to the receiver through resonance between the transmitter and the receiver. The transmitter transforms electricity first into electric signals and then into resonance energy, before transmitting the resonance energy. The receiver and the transmitter have corresponding characteristics in electrical resonance so that the receiver can receive the resonance signals output from the transmitter and then transform the resonance signals into electricity to be consumed by the electrical load of the passive device.
