The utility model relates to the technical field of folding stools, in particular to an improved portable folding stool which comprises a connecting plate and supporting legs, the surface of the connecting plate is connected with a pulling plate in a sliding mode, the bottom end of the connecting plate is fixedly connected with a reinforcing frame, the surface of the reinforcing frame is fixedly connected with a connecting block, and the supporting legs and the connecting block are elastically and rotatably connected. And the bottom end of the connecting plate is fixedly connected with an acting sleeve. Through connection of the supporting spring and the acting block, connection of the control releasing rod and the telescopic spring and abutting connection of the control releasing rod and the acting block, the effect of controlling the acting angle of the acting block in the supporting frame is achieved, the effect of synchronously releasing the supporting legs at the bottom end of the connecting plate through the control releasing rod is achieved, the use performance and effect are improved, the composition structure is simple, and cost is low. And the supporting legs are completely stored in the connecting plate, so that the whole portable folding table is convenient to carry and can also be used as a foot pad, and the application range of the portable folding table is widened.