The supermolecular universal fuel saving pipe capable of step-by-step superstrong activation adopts the step-by-step multiple decomposition and activation and the long-effective splitting technology. Due to the adoption of the fuel saving pipe, a fuel pipe used for various small car using diesel oil or gasoline, transport vehicles, coaches, buses, engineering vans, agricultural vehicles, motorcycles, military vehicles, radio cars, tanks, airplanes, trains, steamships, warships, generators, engines and the like is not only a fuel pipe for transporting fuel oil, but also a fuel pipe type fuel economizer. The functions of the far infrared and negative ions emitted by the fuel economizer and the functions of the activation and decomposition of a plurality of radial high-intensity activation rings are applied on the fuel oil directly, so that the fuel oil molecular group achieves the micro molecularization, the sufficient burning of the fuel oil is facilitated well, and the fuel saving and emission reduction effects are superior. According to the fuel saving pipe, the fuel saving ratio generally achieves 20-40%, the exhaust contaminant, namely CO and HC+NOx is reduced by 70-90% comprehensively, the power is increased by 15-30%, and the fuel saving pipe is most effective in fuel saving ratio, is suitable for being matched with various large-size and small-size new and old cars and ships and various machines for use, and is extremely perfect.