The invention provides a driving device for a spraying pipe. The driving device comprises a motor, a connection gear and an internal meshed rotating disc, wherein a fixed shaft is integrally arranged at the center of the internal meshed rotating disc, the connection gear comprises a large gear disc and a small gear disc, the motor drives the large gear disc, the large gear disc drives the small gear disc to rotate, and the small gear disc is meshed with internal teeth of the internal meshed rotating disc, so that the internal meshed rotating disc is driven to rotate with the fixed shaft as an axle center, and the power is further output to the spraying pipe. According to the invention, the connection gear arranged outside the motor is used to replace an original speed-reducing transmission mechanism, and the small gear disc of the connection gear drives the internal meshed rotating disc to rotate so as to draw steel strips; the force arm is the sum of the radius of the small gear disc and the thickness of the internal teeth of the internal meshed rotating disc, and is much smaller than the radius of the rotating disc in the prior art, thus the force of the rotating disc for tangentially drawing the steel strips is increased and the telescopic reliability of the spraying pipe is improved; and moreover, according to the design, a reducing mechanism in the motor is canceled, and the motor thickness is decreased, thus the thickness of the whole spraying pipe is decreased, and advantages are embodied in peripheries design and holding.