The utility model belongs to the technical field of ion accelerator superconducting cavity processing technology and specifically relates to a full -automatic polishing system of whole chamber of superconducting cavity capillary chemistry buffering is related to. Its characteristics are including the nitration mixture groove, nitration mixture groove upper end links to each other with refrigerating unit through the pipeline, the nitration mixture inslot is provided with heat exchanger, nitration mixture groove lower extreme passes through the pipeline and links to each other with the acidizingfluid delivery pump, the acidizing fluid delivery pump passes through the pipeline and links to each other with the filter, the filter passes through the pipeline and links to each other with superconducting cavity lower extreme and ultrapure water water pump, the ultrapure water water pump passes through the pipeline and links to each other with the ultrapure water water tank, the superconducting cavity upper end links to each other with nitration mixture groove upper end and observation window respectively through the pipeline, the pipeline that high -purity nitrogen gas jar passes throughbetween pipeline and nitration mixture groove and the superconducting cavity links to each other, it can realize the chemistry buffering polishing of polytypic superconducting cavity through adoptingthe computer to carry out the close check to flow, the velocity of flow, temperature, pressure and the time of acidizing fluid. And have very strong corrosion resistance, the height security, reliability, controllability and ease for operation.