The saggar that contains Liion battery cathode material is prone to abnormal lateral movement behavior during the calcination process of roller kiln. So, in this paper, the influence of roller table flexibility on the motion characteristics of the saggar in the driving process is analyzed based on flexibility dynamics. Firstly, a simplified model of the saggarroller table driving dynamics is established based on flexibility dynamics. Using this model, the elastic deformation of the roller and the motion behavior of the saggar during transmission are analyzed, and experiment was conducted to verify the effectiveness of the model. Secondly, the corresponding rigid dynamics model of saggarroller table is established. Through comparing the kinematic characteristic variation of the saggar under the transmission conditions of flexible and rigid rollers and the lateral movement variation of the saggar under different roller deflection, the influence of the flexibility of the roller table on the saggar kinematic characteristic is revealed. Based on these, the original roller was improved, and corresponding experiment was carried out to verify the effect of the improved scheme. Results show that: Because of the influence of elastic deformation, obvious outward expansion of the gaps among the saggars occurs while the saggars are transmitted forward, however there is almost no expansion of the gaps among the saggars when the roller shows rigidity; The deflection of the roller has an important influence on the lateral movement of the the saggars. When the deflection of the roller is changed from 0 to 2 mm, the expansion gap of the saggars increases with the increasing of the deflection. When the deflection of the roller exceeds 2 mm, the expansion gap of the saggars decreases with the increasing of the deflection; The experiment results for the improved roller show that the properly increasing the rigidity of the roller can significantly reduce the abnormal lateral motion of the saggars.