Demountable pneumatic box of marking machine

The invention discloses a demountable pneumatic box of a marking machine. The demountable pneumatic box comprises a square box body (6). Any one of vertical ends of the box body (6) is provided with a connecting plate (11) and a data cable interface (3). The top of the vertical end, opposite to the vertical end with the connecting plate (11), of the box body (6) is provided with an operating face which is provided with control buttons (7). A printing nozzle (5) is connected to the lower end of the box body (6). The connecting plate (11) is provided with a clamp groove (12). The inner side of the clamp groove (12) is provided with a wear-resistant rubber cover (13). Mounting plates (1) extending out are arranged on two sides of the clamp groove (12) and provided with threaded through holes (2). The demountable pneumatic box of the marking machine is simple and reasonable in structure, convenient to mount and demount, and highly practicable.