The invention relates to a water-based wood protection agent, comprising a biocide-containing aqueous emulsion that contains at least one biocidal active ingredient and at least one cationic emulsifier, and the at least one biocidal active ingredient is emulsified by the at least one cationic emulsifier to form active ingredient-emulsifier particles, which are each enclosed by an at least single-layered polyelectrolyte coating, so that the net charge of the enclosed particle is zero or negative.
