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In a process for electrolytic coating of a strand casting mould (2) the internal surfaces (4) of the strand casting mold (2) which demarcates a mould cavity (3) are coated with a coating material for the purpose of achieving or reachieving intended mould cavity dimensions. The strand casting mould (2), as the cathode, an anode (7) positioned in the mould cavity (3) and an electrolyte (25) containing the coating material is used. The electrolyte (25) serving as the carrier of the coating material flows through the mould cavity (3) of the strand casting mould (2) in a controlled manner. During the electrolytic coating, only the internal surfaces of the mould cavity come into contact with the electrolyte and the external surfaces of the strand casting mould therefore do not have to be covered. The mechanical properties can be kept largely uniform over the entire region. The coating can be achieved more rapidly than with the conventional processes. (FIG. 1)