The invention discloses a device for assembling an aluminum strip for an inner shell of a mobile phone. The device comprises a clamped material descending mechanism, a guiding mechanism, a guiding block, the inner shell of the mobile phone, aluminum strip pushing blocks, aluminum strip clamping blocks, an aluminum strip feeding air cylinder, an aluminum strip feeding mechanism, a guiding air cylinder connecting block and a guiding air cylinder. The clamped material descending mechanism is connected with the aluminum strip clamping blocks through connecting shafts. The guiding mechanism is installed in the guiding block. The inner shell of the mobile phone is located on the side face of the aluminum strip. The aluminum strip pushing blocks are connected with the aluminum strip clamping blocks, and the aluminum strip and the aluminum strip clamping blocks are fixedly connected through the aluminum strip pushing blocks. The aluminum strip feeding air cylinder is in transmission connection with the aluminum strip feeding mechanism. The guiding air cylinder is fixedly connected with the guiding air cylinder connecting block, and the guiding air cylinder connecting block is fixedly connected with the guiding block. According to the device for assembling the aluminum strip for the inner shell of the mobile phone, due to the fact that the aluminum strip feeding air cylinder and the guiding air cylinder are arranged, use is more convenient, and efficiency is greatly improved; and the aluminum strip pushing blocks are arranged, and thus the device has the beneficial effects of being more simple in structure, easier to manufacture and the like.