The invention relates to a single-station punching mechanical arm structure which comprises a rack power device, a feeding rack and a main frame, wherein the main frame is composed of an upper frame body and a lower frame body, the feeding rack is installed on the top of the upper frame body, and the rack power device is connected to one side of the feeding rack; a material positioning rack is arranged in the middle of the upper frame body, a material rack is horizontally laid on the surface of the lower frame body below the material positioning rack, and a horizontal cylinder is fixed between the bottom surface of the material rack and the lower frame body; a feeding cylinder is installed in the main frame body below the material rack, an oil storer is installed in the lower frame body, and a power box is fixedly installed outside the main frame. The single-station punching mechanical arm structure has the advantages that when the structure is used, materials are placed on the material rack, pushed to the material positioning rack through the horizontal cylinder, then pushed to a specific height by the feeding cylinder, and finally sent to a needed mold by the feeding rack to be machined, the procedure that materials are placed one by one manually is omitted, the trouble of manual operation is saved, unnecessary material placing mistakes are reduced, a user feels safe, and the number of workers is reduced.