The invention discloses a wireless charging device and a receiving-end device thereof, relating to the field of energy transfer. The receiving-end device comprises M energy receiving modules, an electric energy storage circuit, a detection circuit and an electric level converting circuit. The M energy receiving modules respectively receive M received electric energy by M wireless energy transfer paths, wherein M is natural number. The electric energy storage circuit is coupled with the M energy receiving modules to receive M received electric energy and store the collective electric energy. The detection circuit is used for detecting the detection electric level corresponding to the collective electric energy to generate a first enabling signal. And the electric converting circuit is usedfor responding to the first enabling signal to convert and output the system electric energy according to the collective electric energy.