As one of the most important basic parts in modern industry, the motion characteristics of noncircular gears directly affect the operation of whole mechanism. In order to study the influence of center distance error on the dynamic meshing force of noncircular gears, the dynamic meshing force of different order noncircular gears under the condition of center distance error was simulated and analyzed, and the changing trend of dynamic meshing force of noncircular gears under different center distance error was obtained. The results show that the dynamic meshing force of noncircular gear is different with the different set center distance error, the fluctuation amplitude of meshing force decreases with the decrease of center distance, the fluctuation amplitude of meshing force increases with the increase of center distance, and the variation of meshing force amplitude of noncircular gear is different under different frequencies. The above research can provide reference for improving the transmission performance of noncircular gears, reducing vibration and noise.