Airtight room

The utility model provides an airtight room which comprises a room body, an industrial air conditioning unit arranged on the outer side wall of the top of the room body and connected with an outdoor unit, an upper air supply pipeline arranged on the upper portion of the inner side of the room body and connected with the industrial air conditioning unit, and a lower air return duct arranged at the bottom of the inner side of the room body. A pit is formed in the bottom of the room body and used for burying a lower air return duct, an air groove opening and an air outlet are formed in the lower air return duct, the width of the air groove opening can be adjusted, the air outlet is connected with an industrial air conditioning unit through a second pipeline, and an insertion plate is arranged on the air groove opening and used for adjusting the width of the air groove opening. The airtight room has the advantages of being reasonable in structure, good in temperature control effect, small in temperature differenc