The invention discloses a folding sanitary multifunctional kitchen cutting board, which is a novel cutting board formed by arranging a set of special hinge 2 on the sides of two base plates 1, wherein the base plates 1 are made of timber, bamboo, plastics or other composite materials; and the special hinge 2 is a special variable hinge which is formed by matching several hinges blades 3 with serial shafts 4 and can make surfaces of the two base plates 1 be adhered and folded with each other, be separated and folded in clearance or make the plate bodies be expanded and tightly spliced together, and is provided with a hanging hole 5. The folding sanitary multifunctional kitchen cutting board is simple, convenient, sanitary and multifunctional, and has four small foldable turnover cutting surfaces and two big expanded and spliced cutting surfaces to meet the actual cutting requirements for raw and cooked food of different sizes in the kitchen; besides, the folding sanitary multifunctional kitchen cutting board can be either folded and vertically and stably placed so as to be convenient to drain, dry and collect or hanged vertically to a wall to save space and bring convenience to take and use, therefore, as an assorted appliance of the modern kitchen, the folding sanitary multifunctional kitchen cutting board is more and more popularized due to novel and diverse functions, rational and convenient use, scientific and sanitary effects.