The present invention is to a folding chair with a side bag on one side, composed of a folding stand as well as seat fabric and backrest fabric fixed to the folding stand. When the folding stand is opened, the seat fabric and the backrest fabric are in an unfolded open state with a side bag and a packing strap are provided at the seat fabric edge or on the handrail. The packing strap is behind the side bag. A corresponding locking mechanism is provided at the bottom of the side bag and the packing strap. When the folding stand is folded, the side bag and the packing strap will wrap around the outer sides in opposite directions, forming a binding packaging structure with the interlock of the locking mechanism at the bottom of the side bags.