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This invention discloses an anode device for electroforming additive manufacturing with uniform velocity distribution in long-slit jets. It includes a cover plate, a shell, a bottom cover, a flow rate regulating plate, and inert anode plates. The cover plate and bottom cover are sealed and fixed to the upper and lower ends of the shell, respectively. The shell contains an electrolyte receiving cavity and a liquid inlet, with the inert anode plates symmetrically inserted into the side walls of the liquid inlet. The bottom cover has a long-slit outlet. The flow rate regulating plate is fixed in the receiving cavity, forming a flow rate regulating slit between the two plates. The inlet, receiving cavity, flow rate regulating slit, liquid inlet, and long-slit outlet are sequentially connected. The flow height distribution of the flow rate regulating slit is set according to the natural velocity distribution curve of the long-slit outlet: a parabolic distribution in laminar flow and a 1 / 7 power-law distribution in turbulent flow. This device, by designing the flow rate regulating slit, solves the problem of uneven velocity distribution in long-slit jets, significantly improves the velocity distribution at the jet outlet cross-section, achieves spatial coupling between the flow field and the electric field, and improves the uniformity of the electroforming deposition layer thickness.