The invention discloses a shell structure for mechanical equipment. The shell structure comprises a shell and a shell cover module, wherein the shell is a square structure, and at least one surface is set as an opening; and the shell cover module is positioned on the surface of the opening and used for closing the surface. The invention further discloses a pipe coiling machine; the pipe coiling machine comprises a pipe winding mechanism and an elastic mechanism for providing power for winding of pipes; and the pipe winding mechanism and the elastic mechanism synchronously rotate around a rotating axle (x). The pipe coiling machine further comprises the shell structure; and the shell structure is used for supporting the pipe winding mechanism and the elastic mechanism. In the pipe coiling machine provided by the invention, the shell of the square structure is an integrally molded structure, is stably placed, and is provided with a support part suitable for lateral and/or vertical placement, so that the practicability is high.