System and method for controlling upper limit of humidity of refrigeration house by using dry compressed air

The invention discloses a system and a method for controlling upper limit of humidity of a refrigeration house by using dry compressed air. The system involves the refrigeration house, a fan, a dry steam humidifying pipe, a surface cooler and a dry compressed air pipe, wherein a partition is longitudinally mounted inside the refrigeration house to divide the interior of the refrigeration house into an air return channel and a warehouse, and the top and the bottom of the partition are provided with an air supply filter and an air return filter which enable the air return channel to communicatewith the warehouse correspondingly; the fan is mounted at the top of the air return channel, the fan feeds airflow in the air return channel into the warehouse through the air supply filter, the dry steam humidifying pipe, the surface cooler and the dry compressed air pipe are sequentially mounted in the air return channel from top to bottom, the dry steam humidifying pipe, the surface cooler andthe dry compressed air pip