Oxidation intensifier device for a continuous dyeing system for dyeing a warp thread, the device being arranged for being mounted in the oxidation assembly of the dyeing system, and comprising two blowing assemblies (12, 14) having a substantially identical shape and being opposed one another, each blowing assembly (12, 14) being provided with at least one respective fan (16, 18), the device being characterised in that: - each blowing assembly (12, 14) is provided, downstream of the respective fan (16, 18), with a respective plurality of convergent conduits (20, 22) arranged along development directions that are parallel and transversal to the feeding direction of the warp thread in the dyeing system; - the convergent conduits of a first blowing assembly converge in a opposite direction with respect to the convergence direction of the convergent conduits of the opposite blowing assembly; - each convergent conduit (20, 22) is configured to face parallel to a single lap of the warp thread moving inside the dyeing system; - each convergent conduit (20, 22) is provided with a plurality of longitudinal slots, i.e. slots that are oriented along the same development direction as of the respective convergent conduit (20, 22); - each fan (16, 18) is pneumatically connected to the plurality of convergent conduits of the respective blowing assembly (12, 14) and is configured to convey air, which has been drawn from the environment where the dyeing system operates, towards the plurality of longitudinal slots, a plurality of opposite air laminar flows being generated through said longitudinal slots, said opposite air laminar flows generating a plurality of turbulences adapted to facilitate the oxidation process of the dyed warp thread on both its surfaces; - at least a part of the convergent conduits (20, 22) is provided with respective shutters placed at the respective longitudinal slots; and - the device comprises an electronic control system configured to dynamically adjust, in real time, through the operating parameters of the fans (16, 18), the air speed and flow rate to be blown on the warp thread, said electronic control system being further configured to control the opening and closing of the longitudinal slots of said convergent conduits (20, 22) through the respective shutters. - each blowing assembly (12, 14) is provided, downstream of the respective fan (16, 18), with a respective plurality of convergent conduits (20, 22) arranged along development directions that are parallel and transversal to the feeding direction of the warp thread in the dyeing system; - the convergent conduits of a first blowing assembly converge in a opposite direction with respect to the convergence direction of the convergent conduits of the opposite blowing assembly; - each convergent conduit (20, 22) is configured to face parallel to a single lap of the warp thread moving inside the dyeing system; - each convergent conduit (20, 22) is provided with a plurality of longitudinal slots, i.e. slots that are oriented along the same development direction as of the respective convergent conduit (20, 22); - each fan (16, 18) is pneumatically connected to the plurality of convergent conduits of the respective blowing assembly (12, 14) and is configured to convey air, which has been drawn from the environment where the dyeing system operates, towards the plurality of longitudinal slots, a plurality of opposite air laminar flows being generated through said longitudinal slots, said opposite air laminar flows generating a plurality of turbulences adapted to facilitate the oxidation process of the dyed warp thread on both its surfaces; - at least a part of the convergent conduits (20, 22) is provided with respective shutters placed at the respective longitudinal slots; and - the device comprises an electronic control system configured to dynamically adjust, in real time, through the operating parameters of the fans (16, 18), the air speed and flow rate to be blown on the warp thread, said electronic control system being further configured to control the opening and closing of the longitudinal slots of said convergent conduits (20, 22) through the respective shutters.