The invention discloses black garlic, a process and a device for fermenting the same, which overcomes technical defects of the prior product, processing method and processing device. The black garlic is integral in bulk, dry in outer peel and easy to peel. Garlic cloves are in preserved fruit paste shape, are free from pungent taste, have jelly taste, taste good and are easy to preserve. Every 100 grams of ripening black garlic contains 140 milligrams of isoleucine, 250 milligrams of leucine, 170 milligrams of lysine, 160 milligrams of cystine, S-allyl cysteine and polyphenol of which the content is 22 times that of raw garlic, 36 milligrams of sodium, 930 milligrams of potassium, 52 milligrams of magnesium and 13 milligrams of calcium. The black garlic has the advantages of low heavy-metal content, no pesticide residue and no additive. The fermenting process comprises the steps of taking integral garlic as raw material, initially washing the raw material with clear water, soaking the raw material in brine, placing the raw material in a tray, fermenting, steaming and baking the raw material, performing aging treatment, sterilizing and disinfecting the obtained product, and packing the obtained product in vacuum or with nitrogen. The fermenting process has the advantages of adopting mineral water vapor and discharging air in the whole process, along with few links and low cost. The fermenting device is heated by a steam boiler, has a humidifying vapor pipe, and uses all-wooden fermentation frame and a container.