A black garlic fermentation machine, comprising: a fermentation box (1), a fermentation box cover (2), a fermentation box bearing rack (3), a heating wire or a heating plate (4), a net-shaped rack (5) which is located inside the fermentation box (1), a plurality of small exhaust holes (6) which are provided on the fermentation box cover (2), a fermentation tank temperature display (7), a temperature controller (8), a temperature sensing head (9), a sealant strip (10) which is provided on an edge of the fermentation box, inner and outer interlayers of the fermentation machine, and a machine door interlayer thermal insulation material (11). The black garlic fermentation machine is simple in structure, durable, easy to operate, and is suitable for different customer needs.