The invention discloses a cam turntable. The cam turntable comprises a case (1), a drive device arranged on the case (1), a power output shaft (3) driven by the drive device and provided with a cam (2), and a control device arranged on the power output shaft (3) and used for transferring external impact loads. The cam turntable can bear greater impact loads and can effectively transfer the external impact loads to prevent all parts in the turntable from being damaged, particularly to avoid influencing the accuracy of the turbine. Moreover, the cam turntable also has the function of automatic gap elimination.