The invention belongs to the technical field of food preservation and discloses a controlled atmosphere preservation method of Cantonese style chopped cold chicken. The controlled atmosphere preservation method comprises the following steps: firstly, preparing a whole fresh chopped cold chicken, then cutting the whole fresh chopped cold chicken with an antiseptic cutter, placing the cut fresh chopped cold chicken in a clean packing box, performing heat sealing with a thin film after vacuum pumping, then filling mixed gas of CO2 and N2 and performing preservation. The controlled atmosphere preservation method adopts high-concentration CO2 controlled atmosphere preservation and combines a biological antimicrobial agent gas-phase slow-release sterilization method, the preservation effect is better than that of the present vacuum preservation method, and the shelf life of the chopped cold chicken can reach 45 days.