Variable-volume steam box

The utility model relates to a variable volume type steam box which comprises an inner container, the inner container comprises a first fixing unit, a second fixing unit and a variable unit, the first fixing unit and the second fixing unit are arranged at the two ends of the inner container, the variable unit is connected between the first fixing unit and the second fixing unit, and the variable unit can be folded left and right or up and down between the first fixing unit and the second fixing unit. When the variable unit is in the unfolded state, the volume of the inner container is relatively large, and when the variable unit is in the folded state, the volume of the inner container is relatively small, so that the volume of the inner container is adjustable. Compared with the prior art, the utility model has the advantages that the structure is simple, and the integrity of the actual cooking space after the volume is adjusted is better, so that better sealing performance can be ensured. 本实用新型涉及一种可变容积式蒸箱，包