The present invention relates to 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; b) the addition, under stirring, of the said composition C1 in a polymeric composition C2, the compositions C1 and C2 being immiscible with each other, whereby an emulsion (E1) is obtained; c) the addition, under stirring, of the emulsion (E1) in a composition C3, the compositions C2 and C3 being immiscible with each other, whereby a double emulsion (E2) is obtained; d) the application of a shear to the emulsion (E2), whereby a double emulsion (E3) is obtained; and e) the polymerisation of the composition C2, whereby solid microcapsules dispersed in the composition C3 are obtained.