The present invention relates to a cosmetic composition for coating keratin fibres of the emulsion type, comprising: an aqueous phase, at least one wax, an emulsifying system comprising: i) at least one C12-C22 monoalkylphosphate, ii) at least one acyl glutamic acid having at least one C12-C22 acyl chain, their salt(s), and their mixture(s). The present invention also relates to a method for coating keratin fibres.