A foldable bed sheet drying rack is composed of a hook (1), hinge parts (2) and a support (3). A sleeve (1.1) is installed on the lower portion of the hook (1) and on the upper portion of the support (3), and the hinge parts (2) are installed on two supper rods. When the foldable bed sheet drying rack is used, a bed sheet is dried by spreading the drying rack, when the foldable bed sheet drying rack needs to be stored, the support (1) is folded by rotating the hinge parts (2), the hook (1) is rotated downwards, and therefore the space is saved to the maximum extent.