A folding wheelchair, including a back frame a seat frame a lower frame, two rear wheel assemblies, two front wheel assemblies and an armrest the armrest and the seat frame are hingedly connected to the back frame from top to bottom in a sequence the two front wheel assemblies is connected to the lower frame a sliding guide rail is provided between one end of the seat frame and each rear wheel assembly, and is provided with a sliding block thereon in a sliding fit manner the sliding block is hingedly connected to a lower end of the back frame and the lower frame or the lower end of the back frame is hingedly connected to the sliding block and the lower frame or the lower frame is hingedly connected to the lower end of the back frame and the sliding block The folding wheelchair is safe and reliable touse, and can be folded smoothly and quickly in addition, the folded wheelchair has a small size, and is convenient to lean, against a wall, occupies a small space in a vehicle trunk or under a bed, and is convenient to use when going out.