Ink mixing mechanism was designed and space rolling track of ink mixing rod was realized by referring to manual mixing flour posture. Space rolling track of ink mixing rod was simulated and validated by simulation based on Matlab project software programming. Two and three dimensional simulation rotary wheel curves similar to manual mixing flour posture were realized. Autorotation and revolution movement of planetary gear train of ink mixing mechanism was analyzed and calculated by simulation. The result showed that the running state of planetary gears is good under different motor speed.