The invention relates to a food processing device, in particular to a vacuum unfreezing device for unfreezing frozen meat food. The vacuum unfreezing device is characterized by comprising a vacuum chamber, wherein an ordinary pressure opening is formed in the side wall of the vacuum chamber; an ordinary pressure valve is arranged on the ordinary pressure opening; a vacuumizing device, a steam generating device and a pressure gauge are arranged at the top of the vacuum chamber; a vacuumizing opening of the vacuumizing device is communicated with the vacuum chamber; a steam outlet of the steam generating device is communicated with the vacuum chamber. The vacuum chamber is internally provided with a sliding trolley for accommodating food to be unfrozen, a handle is arranged on one side of the sliding trolley, a door opening for the sliding trolley to come in and out is formed in the side wall of the vacuum chamber corresponding to the handle, and the door opening is provided with a rolling door. After the rolling door and the ordinary pressure valve are closed, the vacuum chamber is closed. The food unfrozen by using the vacuum unfreezing device is relatively good in quality and free of microbial pollution.