A wireless charging device capable of charging an electronic device is provided. The wireless charging device includes a supporting component, a stage and at least one electrical transmitter. The stage is used to carry the electronic device and is swingingly disposed on the platform through the supporting component. The electrical transmitter is movably disposed in the stage. When the electronic device is placed on an end of the stage which is relatively away from the supporting component, the stage swings in relative to the platform by using the supporting component as a fulcrum, and the stage is inclined to the platform. As a result, the electrical transmitter moves toward the electronic device due to gravitational pull, and thereby aligns with an electrical receiver in the electronic device so as to wirelessly charge the electronic device.