A method for preparing solid microcapsules that comprises of the following steps: a) the preparation of a composition C1, comprising at least one water-soluble or hydrophilic substance dispersed in a hydrophobic phase, said substance having a solubility in water, measured at ambient temperature, at T = 25°C ± 2°C, and at ambient pressure, at 0.1013 MPa (or 1,013 mbar), at least equal to 1 g/L; b) the dropwise addition, under agitation, of said composition C1 in a polymeric composition C2, the compositions C1 and C2 being immiscible with each other, said composition C1 being at a temperature comprised from 0°C to 100°C, the composition C2 comprising at least one monomer or polymer, at least one crosslinking agent, and optionally at least one photoinitiator or a crosslinking catalyst, and being at a temperature comprised from 0°C to 100°C; the viscosity of the composition C2 being comprised between 500 mPa.s and 100 000 mPa.s at 25°C, and preferably being greater than the viscosity of the composition C1, whereby an emulsion is obtained comprising droplets of the composition C1 dispersed in the composition C2; c) the dropwise addition, under agitation, of the emulsion in a composition C3, the compositions C2 and C3 being immiscible with each other, said emulsion being at a temperature comprised from 15°C to 60°C and said composition C3 being at a temperature comprised between 15°C and 60°C; the viscosity of the composition C3 being comprised between 500 mPa.s and 100,000 mPa.s at 25°C, and preferably being greater than the viscosity of the emulsion; whereby a double emulsion is obtained comprising droplets dispersed in the composition C3; d) the application of a shear to the emulsion; whereby a double emulsion is obtained comprising size controlled droplets dispersed in the composition C3; and e) the polymerisation of the composition C2, whereby solid microcapsules dispersed in the composition C3 are obtained, the viscosities being measured, for a shear rate equal to 10 s -1, by means of a rheometer, equipped with a cone having 60 mm diameter and 2 degrees cone angle, and a temperature control cell set at 25°C. a) the preparation of a composition C1, comprising at least one water-soluble or hydrophilic substance dispersed in a hydrophobic phase, said substance having a solubility in water, measured at ambient temperature, at T = 25°C ± 2°C, and at ambient pressure, at 0.1013 MPa (or 1,013 mbar), at least equal to 1 g/L; b) the dropwise addition, under agitation, of said composition C1 in a polymeric composition C2, the compositions C1 and C2 being immiscible with each other, said composition C1 being at a temperature comprised from 0°C to 100°C, the composition C2 comprising at least one monomer or polymer, at least one crosslinking agent, and optionally at least one photoinitiator or a crosslinking catalyst, and being at a temperature comprised from 0°C to 100°C; the viscosity of the composition C2 being comprised between 500 mPa.s and 100 000 mPa.s at 25°C, and preferably being greater than the viscosity of the composition C1, whereby an emulsion is obtained comprising droplets of the composition C1 dispersed in the composition C2; the composition C2 comprising at least one monomer or polymer, at least one crosslinking agent, and optionally at least one photoinitiator or a crosslinking catalyst, and being at a temperature comprised from 0°C to 100°C; the viscosity of the composition C2 being comprised between 500 mPa.s and 100 000 mPa.s at 25°C, and preferably being greater than the viscosity of the composition C1, whereby an emulsion is obtained comprising droplets of the composition C1 dispersed in the composition C2; c) the dropwise addition, under agitation, of the emulsion in a composition C3, the compositions C2 and C3 being immiscible with each other, said emulsion being at a temperature comprised from 15°C to 60°C and said composition C3 being at a temperature comprised between 15°C and 60°C; the viscosity of the composition C3 being comprised between 500 mPa.s and 100,000 mPa.s at 25°C, and preferably being greater than the viscosity of the emulsion; whereby a double emulsion is obtained comprising droplets dispersed in the composition C3; the viscosity of the composition C3 being comprised between 500 mPa.s and 100,000 mPa.s at 25°C, and preferably being greater than the viscosity of the emulsion; whereby a double emulsion is obtained comprising droplets dispersed in the composition C3; d) the application of a shear to the emulsion; whereby a double emulsion is obtained comprising size controlled droplets dispersed in the composition C3; and e) the polymerisation of the composition C2, whereby solid microcapsules dispersed in the composition C3 are obtained,