The utility model discloses a fixed foldable closet which comprises fixed back post brackets, a fixed connecting rod, a side guard board and a seat ring. The fixed foldable closet is characterized in that the middle parts of movable front post brackets are movably installed on the side guard board; the seat ring is fixed between two movable front post brackets and a middle connecting rod of the movable front post brackets. The utility model also comprises a handrail board bracket, a side supporting rack, a handrail board and a backrest. On the basis of the fixed back post brackets, the fixed connecting rod, the side guard board and the seat ring, the utility model is additionally provided with a foldable mechanism composed of the movable front post brackets, the middle connecting rod of the movable front post brackets, the handrail board bracket and the side supporting rack. The foldable mechanism can rotate around the side guard board. Thus, the utility model can clean without leaving the closet after defecating, and has the advantages of comfort of a sitting closet and convenience, little space occupying, lightness and easy use of a squatting closet; the utility model is suitable for families and hospitals having small toilets and heavy economic burden.