Embodiments of this application describe a middle frame and a terminal device, where the middle frame includes a middle plate, at least one middle element, at least one welding platform, and an outer frame. The at least one middle element is fixedly connected to an edge of the middle plate, and the at least one welding platform is fixedly connected to an inner side of the outer frame. Further, the at least one welding platform on the outer frame is in welded connection with the at least one middle element on the middle plate.