A mobile terminal protection sleeve (100), comprising a sleeve body (120), communication terminals (140), an internal lead, a flexible data line (160), and a flexible connector (180). The sleeve body (120) can surround the edge of the mobile terminal, and is provided with a plurality of terminal accommodating holes and an opening, and the opening corresponds to the communication interface of the mobile terminal. A plurality of communication terminals (140) is provided for communicationally connected to an external device (200). The plurality of communication terminals (140) are embedded in the plurality of terminal accommodating holes in one-to-one correspondence. The internal lead is wrapped in the sleeve body (120), and one end of the internal lead is electrically connected with the communication terminals (140). One end of the flexible data line (160) is connected with the sleeve body (120), and the other end of the internal lead is electrically connected with the flexible data line (160). The flexible connector (180) is connected with the other end of the flexible data line (160), and the flexible connector (180) can be inserted in the opening, and is in a butt joint with the communication interface.