Continuous method for the sterilisation of an emulsified dermo-cosmetic product, comprising an emulsive base for 90% to 99% by volume of the product composed of at least an aqueous component and a fatty component and additional products, wherein the flow rate is the same throughout the plant implementing steps iii) and iv), the whole formed by the emulsive base and the additional products constituting a formulation, which method comprises the steps of: i. determining a data pair including a combination of components of the formulation, so-called partial formulation and comprising the emulsive base, with a viscosity η lower than 500 cP at a preheating temperature T1 comprised between 80°C and 90°C; ii. obtaining a pre-emulsion by mixing under stirring in a non-sterile environment the components of the partial formulation determined in i); iii. pre-heating the pre-emulsion obtained in step ii) at the temperature T1 determined in step i); iv. sterilising the pre-emulsion pre-heated in step iii) through a vapour-infusion process comprising jet-spraying the pre-emulsion in a chamber filled with purified water vapour, brought at a temperature T2, followed by a station for holding at the temperature T2 and a station for rapid cooling down to a temperature T3, to obtain a reduction by at least 15 Log of the microbial content of the pre-emulsion; v. sterilising the other components of the formulation separately from the pre-emulsion; vi. mixing, under stirring and in a sterile environment, the sterile pre-emulsion obtained in step iv) with the sterile components, sterilised in step v) so as to obtain the sterile emulsified dermo-cosmetic product, according to the formulation; characterised in that the partial emulsion heated at the temperature T1, retains its dynamic viscosity as a function of the shear rate in a test consisting in subjecting said partial emulsion to increasing and then decreasing shear rates comprised between 10 s -1 and 150 s -1. i. determining a data pair including a combination of components of the formulation, so-called partial formulation and comprising the emulsive base, with a viscosity η lower than 500 cP at a preheating temperature T1 comprised between 80°C and 90°C; ii. obtaining a pre-emulsion by mixing under stirring in a non-sterile environment the components of the partial formulation determined in i); iii. pre-heating the pre-emulsion obtained in step ii) at the temperature T1 determined in step i); iv. sterilising the pre-emulsion pre-heated in step iii) through a vapour-infusion process comprising jet-spraying the pre-emulsion in a chamber filled with purified water vapour, brought at a temperature T2, followed by a station for holding at the temperature T2 and a station for rapid cooling down to a temperature T3, to obtain a reduction by at least 15 Log of the microbial content of the pre-emulsion; v. sterilising the other components of the formulation separately from the pre-emulsion; vi. mixing, under stirring and in a sterile environment, the sterile pre-emulsion obtained in step iv) with the sterile components, sterilised in step v) so as to obtain the sterile emulsified dermo-cosmetic product, according to the formulation;