Pipeline internal weld joint painting device for building pipeline pavement

The invention discloses a pipeline internal welding seam painting device for building pipeline pavement, and relates to the technical field of pipeline construction, the pipeline internal welding seam painting device comprises a painting assembly, a driving assembly and a fixing assembly, the painting assembly comprises a sleeving ring, the sleeving ring is in a circular ring shape, the driving assembly is fixedly connected to the outer side face of the sleeving ring, and the fixing assembly is fixedly connected to the driving assembly; and meanwhile, connecting holes are formed in the positions, away from the center position, of the two sides of the sleeving ring in the four directions, the connecting holes in the two sides correspond to one another, and connecting rods are fixedly connected into the connecting holes. Transmission gears at the two ends of the inner side face of a transmission crawler belt rotate in the same direction, at the moment, under the acting force that a transmission wheel is meshed