In order to meet the thick layer working condition of the circular cooler, the rocker device for the pallet of the circular cooler was analyzed to ensure the structural strength of the rocker device. The rocker device was simulated and analyzed by using finite element method based on the computer simulation software ansys platform. According to the result of the simulation computation, the method of local structure optimization was adopted to improve the strength of the whole structure of the rocker device, providing theoretical basis for future design and manufacturing.