The invention discloses a stable pipeline support. The stable pipeline support comprises a support body, supporting feet and a containing groove. An air bag is mounted at the bottom of the support body, the three sets of supporting feet are mounted on the outer side wall of the support body, sleeves are arranged below the supporting feet, the containing groove is formed in the top of the support body, an upper pressing plate is arranged above the support body, upper mounting parts are mounted on the left side wall and the right side wall of the upper pressing plate, fixing rods are mounted onthe tops of the upper mounting parts, lower mounting parts are mounted on the left side wall and the right side wall of the support body, and through holes are formed in the tops of the lower mountingparts. Through the air bag mounted at the bottom of the support body, external impact borne by the pipeline support can be relieved, the pipeline support is prevented from being overturned, meanwhile, the three sets of supporting feet are mounted on the outer side wall of the support body, triangle supporting is stable, thus, the stability of the pipeline support is improved, influences caused during pipeline machining are avoided, the pipeline machining effect is guaranteed, and the stable pipeline support is suitable for being widely used and popularized.