The invention relates to a spray pipe capable of realizing the annular gas jet and belongs to the field of mechanical design. The spray pipe comprises an outer cylinder and a solid pillar. The solid pillar is thick in upper part and thin in lower part. Corresponding to the axis part of the outer cylinder, the solid pillar is provided with a hole. The hole is thick in upper part and thin in lower part. The diameter of the lower thin part of the hole is matched with the diameter of the lower part of the solid pillar. The lower part of the hole and the lower part of the solid pillar are tightly matched with each other and connected together at the bottom end of the outer cylinder, so that the coaxiality of the outer cylinder and the solid pillar is ensured. An air vent is arranged above the tightly matched part of the outer cylinder and the solid pillar and is used for the gas to flow in. The outer cylinder is also provided with a gas measuring hole and a gas chamber is arranged on the inner side of the outer cylinder. The bottom of the outer cylinder is provided with a small through hole. The solid pillar can be manufactured as pillars of different series and different specifications. Through replacing different solar pillars, annular pipes of different sectional areas can be obtained, so that different gas speeds can be realized. According to the technical scheme of the invention, the annular and uniform gas jet can be realized. Meanwhile, gas parameters at different parts inside the pipe can be measured, so that the outlet speed of the pipe can be figured out. The solid pillar is easy to replace, so that annular pipes of different sectional areas can be obtained.