The X-ray pipeline crawlers include the special part that can detect the welding line of long pipeline. The X-ray pipeline crawlers have the advantages of high radiographic quality, high imaging sensitivity, low failure rate and high work efficiency. The X-ray pipeline crawlers have differential driving and vibration absorbers. The chassis of the X-ray pipeline crawlers can be moved in the pipeline steadily without off center running and overturning. The X-ray pipeline crawlers can be moved in the pipeline with great efficiency because it is controlled by PLC with protecting it from blocking and under voltage. The X-ray pipeline crawler is easy to be separated into several parts and then to be put together, so it is easy to carry. You can change the exposure parameter and make the X-ray pipeline crawler move, stop and have an exposure with the exterior controlling source. The X-ray pipeline crawlers are easy to operate.