The invention provides a bent pipe machining method and a bent pipe, and belongs to the technical field of bent pipe machining. The method adopts an eccentric straight pipe and an induction heater. The method comprises the steps that S1, the eccentric straight pipe is mounted on a support table, a to-be-bent section is sleeved with an intermediate frequency induction heating ring, a first pipe section is movably mounted in a guiding assembly, the end of a second pipe section is clamped through a front chuck, and a rear pushing bent chuck clamps the end of the first pipe section and pushes thefirst pipe section to move in the direction of the to-be-bent section; and S2, intermediate frequency current is introduced into the intermediate frequency induction heating ring, the to-be-bent section is heated, when the temperature of the to-be-bent section is increased to a plastic state, the first pipe section is advanced through mechanical thrust, the to-be-bent section is bent, and the bentto-be-bent section is quickly cooled with a coolant. The bent pipe machining method adopts the eccentric straight pipe with the outer diameter being changed, the inner side thickening amount of the machined bent pipe is reduced, and the weight of a pipe system is reduced.