The utility model provides a multi-functional mobile phone protective sleeve which comprises a casing and an electronic device installed in the casing. The multi-functional mobile phone protective sleeve is characterized in that the electronic device is formed by a Bluetooth module, an antenna, a microphone, an audio amplifier, a speaker, a storage battery, a mobile phone charging circuit, a mobile phone charging interface, a storage battery charging circuit and a power supply interface. The Bluetooth module is electrically connected with the antenna, the microphone, the audio amplifier and the storage battery respectively. The audio amplifier is electrically connected with the speaker. The storage battery is electrically connected with the charging circuit. According to the multi-functional mobile phone protective sleeve, functions of a mobile power supply, a Bluetooth hand-free device and a mobile phone protective sleeve are integrated in one device, and the use of the device by people is greatly facilitated.