The anodizing treatment station (3) in a vertical paint plant (2) of aluminum profiles hanging in succession by means of hooks (8) on a main overhead conveyor (4) moving along a main conveyor line (5) which passes through at least one pre-treatment station and at least one powder or liquid paint station, comprises at least one oxidation bath (9) and a secondary overhead conveyor (10) moving along secondary conveyor line (11) in synchronism with said main conveyor (4), the main conveyor line (5) having a first main loading and/or unloading segment (12), facing said oxidation bath (9), wherein specific first main loading and/or unloading means (13) are adapted to transfer groups (8c) of hooks (8) from said main conveyor (4) to said oxidation bath (9) and/or vice versa, in that the secondary conveyor line (11) has a first secondary loading and/or unloading segment (14), facing said oxidation bath (9), wherein specific first secondary loading and/or unloading means (15) are adapted to transfer groups (8c) of hooks (8) from said secondary conveyor (10) to the oxidation bath (9) and/or vice versa, a first diverter (21) being provided which upstream of the oxidation bath (9) alternately transfers to the secondary conveyor (10) groups (8c) of hooks (8) conveyed by the main conveyor, and a second diverter (22) which to recompose the continuous succession of hooks (8) downstream of the oxidation bath (9) transfers the groups (8c) conveyed by the secondary conveyor (10) to the segments (8b) without hooks (8).