Bent pipe formed by welding multiple straight pipes

The utility model relates to a bent pipe, in particular to a bent pipe formed by welding multiple straight pipes. The bent pipe comprises straight pipes and a corner pipe; the straight pipes comprise a straight pipe I, a straight pipe II and a straight pipe III; one end of the straight pipe II is welded and fixed to the straight pipe I; the other end of the straight pipe II is welded and fixed to the upper end of the corner pipe; the straight pipe III is welded and fixed to the lower end of the corner pipe; wall thickness and diameters of the straight pipes I, II and III are the same with that of the corner pipe; the welding surface angle of each two of the straight pipes I, II and III and the corner pipe are the same; the quantity of the straight pipes is at least two; and the quantity of the corner pipe is at least one. The bent pipe is simple to manufacture, does not need to open dies, is easy to realize, saves the cost, and improves the effect.