A protective case for an electronic device includes a PCB and other components and devices. The other components and devices arranged on the case are connected to the PCB, the devices include a battery, a socket configured to accommodate a wireless communication device, a data connector, a wireless communication module, and a control module. The control module controls the battery to charge the electronic device and activates the wireless communication module to connect to the electronic device through the data connector, if the data connector is in use. The wireless communication module is controlled to communicate with the wireless communication device if the wireless communication device is removed from the socket and the battery is controlled to supply power to the wireless communication device if the wireless communication device is inserted into the socket.