The utility model discloses an adjusting device, the device includes: radial adjustment Assembly, radial adjustment Assembly's one end is connected with the one end of first mounting panel, the spray gun, the one end of spray gun with the other end of first mounting panel is connected, travel unit, travel unit with radial adjustment Assembly's the other end is connected, the rotation support arm, the rotation support arm is connected radial adjustment Assembly one end with between radial adjustment Assembly's the other end, wherein, the device is when the spraying pipeline, travel unit hugs closely the pipeline surface, radial adjustment Assembly is right the spray gun carries out automatic radial distance to be adjusted for the spraying in -process the spray gun with the distance on pipeline surface remains the unanimity throughout to guarantee the spraying quality, so, guaranteed that even coating is unanimous, improved the spraying quality.