The invention discloses a pipeline outer wall spraying device for automobile manufacturing. The pipeline outer wall spraying device comprises a base, a paint barrel, a draught fan, a sealing plate, amixing cover, a base plate and a pipeline body. A paint spraying pipe is fixedly connected to the bottom of the mixing cover, and spraying heads are vertically, evenly and fixedly connected to the right side of the paint spraying pipe. The pipeline outer wall spraying device for the automobile manufacturing has the beneficial effects that in the using process, the draught fan pumps outside air into the mixing cover, in the process, the anticorrosive paint enters the mixing cover at the same time, the air is mixed with the paint, the paint can be primarily atomized and then sprayed out after being secondarily atomized by the spraying heads, the atomization degree of the paint is higher, a formed coating is finer, in the spraying process, a motor drives the pipeline body to rotate, so that the outer wall of the pipeline body can be comprehensively sprayed , manual overturning is avoided, and therefore the labor intensity is reduced.