The invention relates to the technical field of heating conveying, in particular to a spraying device for heating and ventilation pipe fitting production treatment. The device comprises a bottom plateand two fixing frames, wherein the two fixing frames are slidably connected to the two ends of the bottom plate correspondingly, and a first inner column and a second inner column are arranged between the two fixing frames correspondingly. According to the spraying device, a second motor rotates to drive a gear to rotate, the gear meshes with a rack, an outer cylinder slides towards one side of the second inner column, when a pipeline passes through a paint spraying wheel, the paint spraying wheel is started, paint is completely smeared on the outer side wall of the pipeline, and a first motor drives the first inner column and the second inner column to rotate, so that the pipeline can circumferentially rotate, when the pipeline passes through a coating plate, a sponge roller of the coating plate slides to be extruded and attached to the side wall of the pipeline, and the pipeline can rotate relative to the coating plate, so that the paint on the pipeline is completely and uniformly distributed, the quality of pipeline spraying is improved, and the paint is more uniformly smeared.