The invention provides a manufacturing method of a shell, the shell and a mobile terminal. The manufacturing method of the shell comprises the steps of providing a first shell base body; providing a forging die, wherein the forging die is provided with a first forging die body and a forging sliding block in sliding connection to the first forging die body, the first forging die body is provided with a first parting surface and a first cavity formed in the first parting surface, the sliding direction, relative to the first forging die body, of the forging sliding block is parallel to the firstparting surface, and the forging sliding block is provided with a sliding cavity; placing the first shell base body into the forging die; obtaining a second shell base body, wherein the second shell base body is provided with a back curve face and a peripheral curve face connected to the peripheral edge of the back curve face; machining the back curve face and the peripheral curve face. The forging sliding block carries out forging on the peripheral face of the first shell base body, the peripheral curve face of the shell is obtained, abut-joint smoothness of the appearance curve face of the shell is ensured, and production efficiency is improved.