A foldable chair, comprises a foldable chair frame (10) and a chair seat (1) made of a flexible material; the chair frame (10) comprising an X-shaped left support frame (101), an X-shaped right support frame (102) connected through a connecting crossbar (3), the chair seat (1) is connected to the chair frame (10) through a plurality of connecting pieces; a detachable pole (2) extends from top to bottom of the chair frame (10), and the connecting crossbar (3) has two first through holes (34) for the poles (2) to pass through; correspondingly, the connecting crossbar (3) has two second through holes (33) for a plurality of support tubes (100) to pass through; each pole (2) and the corresponding support tube (100) forms the X-shaped left or right support frame. This chair has the advantages of simple and reasonable structure, easy installation and disassembly, simple manufacture process and low cost, and is especially suitable for carrying around when traveling.