The invention relates to an automatic quick separating mechanism for rhizomes of garlic. The automatic quick separating mechanism comprises a supporting assembly, a rhizome removing assembly, a cutting assemble and a conveying assembly; the rhizome removing assembly is arranged below the supporting assembly and comprises a sliding unit a, a driving unit which is coaxially connected with the sliding unit a and a rotating unit which is fixedly arranged below the sliding unit a; the cutting assembly is horizontally and symmetrically arranged along the center line in the length direction of the supporting assembly and comprises a connecting rod unit and a cutting unit; the conveying assembly is fixedly arranged below the supporting assembly. By means of the automatic quick separating mechanism, the technical problem that when the garlic is subjected to rhizome cutting, the rhizomes of the garlic cannot be thoroughly cut off is solved, the production efficiency is then improved, the labor force is saved, and the production cost is reduced.