The invention concerns a system for the local surface treatment of an aeronautical part (1) to be treated. Said system is characterised in that it comprises a plurality of reservoirs (18, 19, 20, 21} each comprising a treatment product (22, 23, 24, 25), at least one bath box (102a, 102b) suitable for delimiting a sealed space (26a, 26b) between said bath box (102a, 102b) and a portion (101a, 101b) of the part to be treated, and a controlled circuit (10) for supplying said sealed space (26a, 26b) with treatment product (22, 23, 24, 25) from the reservoirs (18, 19, 20, 21) linking at least said reservoir (18, 19, 20, 21) to said sealed space (26a, 26b) and comprising valves allowing the management of the supply of the sealed space by one or more reservoirs of the plurality of reservoirs.