A free arm umbrella includes a fixing plate, an upper nest, a lower nest, umbrella ribs and support ribs. The free arm umbrella also includes a control mechanism, a support rod, a first strut rod and a second strut rod. The middle part of the first strut rod is hinged with the middle part of the second strut rod. A rotating lockout mechanism can also be set on the free arm umbrella so that the umbrella cover can be rotated easily. The free arm umbrella has advantages of simple structure, convenience of use, economic practicality, and being applicable to narrow space.