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This invention discloses a cooking appliance and its cooking control method, as well as a computer-readable storage medium. The cooking appliance includes a pot body and a heating element. The pot body forms a cooking cavity, and the heating element heats the cooking cavity. The cooking control method includes the following steps: based on the working stage of the cooking appliance, entering a deactivation stage; controlling the treatment of the cooking cavity, the treatment including at least one of heating, vacuuming, and oxygen removal; controlling the working stage of the cooking appliance to enter the cooking stage. The technical solution of this invention aims to enable the cooking appliance to undergo deactivation treatment before steaming or boiling, preventing the food to be cooked from discoloring and turning yellow after high-temperature cooking, thereby improving the cooking effect and reliability of the cooking appliance.