A 500-cubic-meter professional Controlled Atmosphere (CA) Fresh-Keeping Storage facility, equipped with a high-efficiency fully enclosed integrated unit and a dual-door CA system, creates a stable and reliable gaseous storage environment. This integrated unit operates smoothly with precise temperature control. Combined with two sets of sealed CA doors, it effectively maintains the low-oxygen, high-nitrogen gas ratio inside the storage, significantly inhibiting the respiration of fruits and vegetables. This extends the preservation period to 2-3 times that of a traditional cold storage. The overall design balances energy efficiency and operational convenience, making it suitable for the long-term preservation storage of high-value produce, medicinal herbs, and other materials with stringent storage atmosphere requirements.