Fatigue testing device for swing rotating shaft

The invention relates to a fatigue testing device for a swing rotating shaft, which comprises two bases, a frame body, an angle scale, two height adjusting units, two swing motors, two eccentric rods, a guide rod, a sliding unit, a second connecting rod, a rotating shaft connecting unit and a load assembly, wherein the swing motor is arranged on a height adjusting push shaft, one end of the eccentric rod is connected with a swing output shaft, and the other end of the eccentric rod is connected with a first connecting rod. The guide rod is arranged on the eccentric rod, the sliding unit is arranged on the guide rod, and adjustment of the distance between the axis of the second connecting rod and the axis of the swing output shaft is achieved through position adjustment of the sliding unit. The rotating shaft connecting unit is arranged in the middle of the second connecting rod. A swing rotating shaft to be tested is connected below the rotating shaft connecting unit. Compared with the prior art, the swing load is multiplied through a structure capable of flexibly adjusting the eccentric distance, and the eccentric distance is adjusted through the cooperation of the sliding unit and the guide rod, so that different test strengths are matched according to different test standards.