A portable folding chair suitable for travel and leisure can be used, e.g., in households, outdoors, and in a garden. The folding chair includes a chair support frame, a surface fabric, a backrest, arms, and shoes. The chair support frame includes seating frame tubes, back-rest tubes, arm front support tubes, front support legs, front cross tubes, rear support legs, connection sliding blocks, locking sliding blocks, arm sliding blocks, rear cross tubes, locking fixtures, fixing elements, sliding locating blocks, rotating support blocks, and U-shaped hinging pieces. The front and rear support legs form an inverted V-shaped support structure when unfolded, and are drawn in when folded, because the chair is connected by cross tubes and inverted V-shaped support legs.