The invention discloses a charging device which comprises a rotating body, two charging bodies and a rotating shaft, wherein the two charging bodies are arranged on the rotating body, the rotating shaft penetrates through the rotating body, and each charging body comprises a plurality of magnetic elements, a bearing body and a shell, wherein the bearing body is used for bearing the magnetic elements, and the shell is provided with a coil; the bearing body is fixedly arranged on the rotating body; the shell is used for accommodating a battery to be charged, and the coil is used for being connected with the battery to be charged; the rotating shaft penetrates through the rotating body and the bearing body and is connected with the shell; and when the rotating body is subjected to an external force and rotates, the shell is rotationally connected relative to the rotating body and the bearing body, so that induced current is generated by cutting a magnetic line of force by the coil arranged on the shell to charge the battery to be charged. The charging device does not need an external power supply in the whole charging process and is convenient to use.