A suspensory foldable chair has a support structure which is composed of four arc-type pipes, and the foldable chair is hung on the support structure by connecting a spring with a flexible belt; the height of the foldable chair can be adjusted according to the height of human body; the chair back, the sitting surface, and the leg baffle of the chair have adjustable angles and lengths, and can be turned to become a plane for lying; the angle and the height of the armrests are adjustable according to human performance, and the armrests can be rotated freely and be used as a supporting surface for computer keyboard, mouse and writing operation; and the foldable chair can also be used as a rotatable foldable chair. The invention has simple product processing technology, a stable structure, and comfortable human performance. The invention is widely applicable to various office, household, and leisure places.