The invention discloses a
machining method of a clearance area of a shell. The method comprises the steps that the shell is provided, wherein the shell is made of
signal shielding materials and provided with a preset area, and the preset area comprises a first surface and a second surface which are oppositely arranged; at least one support structure is machined on the first surface of the preset area; a
laser cutting machine is aligned with the second surface of the preset area, a preset number of hair cracks are
cut in the preset area, and the hair cracks are arranged at intervals in parallel; each hair crack is filled with materials which do not shield signals, so that the clearance area is obtained; the support structures are
cut out. According to the
machining method of the clearance area of the shell, the preset number of the hair cracks are
cut in the shell through lasers, and the hair cracks are filled with the materials, so that the clearance area is formed, and the clearance area with a specific shape is obtained; meanwhile, due to the fact that the hair cracks are narrow, the proportion of the materials which do not shield the signals in the shell is decreased, and the appearance integrity of the shell is guaranteed. The invention further provides the shell and a mobile terminal.