Aiming at the problem that the general programming teaching spraying robot programming is complicated and is not suitable for the production requirements of rapid product changes,a drag teaching spraying robot was designed and the motion data was optimized. The mechanism design scheme was proposed, and the balance of important mechanisms was analyzed and calculated.A motion optimization method was proposed to solve the problem of the track deviation distortion caused by the uneven speed when the spraying robot was manually moved.By dividing the optimization area, the cubic spline curve of the motion trajectory was obtained, and the interpolation was substituted into the operation. It is proved by examples when the optimized motion data is reloaded into the drag teaching robot processor, the optimized speed curve changes from the original polyline to a smooth curve, which makes the robot move with a stable speed and smooth rotation trajectory