Pipeline opening aligning device and welding system thereof

The utility model provides a pipeline opening aligning device and a welding system thereof. The pipeline opening aligning device comprises a support, a base and two rollers. The base is arranged on the support and can move up and down on the support in the vertical direction and/or move left and right on the support in the horizontal direction in a reciprocating mode. The two rollers are arranged on the base in a V shape, and the V-shaped upper surface is used for bearing the pipeline. According to the technical scheme, the pipeline opening alignment problem can be effectively solved, and therefore the two-to-one opening alignment welding quality and welding efficiency are improved; furthermore, two groups or multiple groups of pipeline aligning devices are used in a matched manner, so that the pipeline aligning device is suitable for two-in-one prefabrication on land and can also be used for prefabrication and main operation line aligning construction on a pipe laying ship, and the purposes of pipeline trans