The invention discloses a sealed curved line pipe bending technology. Bending of continuous multiple-segment arc sealed curved line pipes can be achieved through a sequence of technology procedures, namely, arc fitting, one-time bending, sample pipe reverse engineering, second-time fitting, multiple-time bending, parameter confirming, massive production and welding forming. Thus, massive production of sealed curved line bent pipes is achieved, the production process is stable and production efficiency is high.