Abstract: In order to reflect the complex system characterization of biomass growth in penicillin fermentation process, this paper established a biomass growth visual model of penicillin batch fermentation process based on cellular automata by studying the mechanism of penicillin batch fermentation process biomass growth. The model uses color parrern to describe the growth evolution process of penicillin biomass, and its evolution rules are designed based on penicillin batch fermentation process biomass growth mechanism and dynamics differential equations. The model conforms with special characteristics of diversity, random and uncertainty in penicillin batch fermentation process well. Simulation results show that the visual model described the evolution behavior of penicillin fementation process biomass growth well.