The invention discloses a shell machining method. The shell machining method comprises the steps that a shell is provided and is provided with a function hole; the shell is fixed to a polishing jig; supporting jigs penetrate the function hole and stretch out of the function hole, so that the supporting jigs block an opening, in the outer surface of the shell, of the function hole; a polishing consumable polishes the outer surface of the shell, so that the shell obtains a polishing face of preset precision; and after the shell obtains the polishing face of preset precision, the supporting jigsare taken out. According to the shell machining method, the shell and a mobile terminal, the supporting jigs are arranged in the function hole and stretch out of the function hole, the supporting jigscan support a hollow area of the function hole, and therefore when the shell with the function hole is polished, the edge of the function hole cannot collapse, and the percent of pass during productmachining is improved. The shell and the mobile terminal are further provided.