A method for compression-forming of thermoplastic objects, making use of a die which comprises: a female part having a matrix cavity and at least a male part destined to penetrate the matrix cavity in order to define a forming chamber, in which the female part comprises two complementary and mutually-couplable sections, in which: a first section has a first cavity, which wholly or partly defines the matrix cavity of the female part, destined to contain a batch of material and has walls (11, 12) which are relatively slim; a second section is destined to complementarily contain the first section, and adhere at least partly to the external surface (11 a, 12a) of the first section, the second section having a structure which is substantially undeformable under forming pressures and being destined, by adhesion thereof with the first section, to render the matrix cavity non-deformable when subjected to forming pressure, the two sections (10, 20) being operatively separable and distanceable from one another and defining, when reciprocally coupled, a single female part of die and further making use of a heating means, separate and located at a distance from the second section of female part, the method being characterised in that it comprises: completely extracting and distancing the first section from the second section of female part, inserting a batch of material internally of the cavity of the first section, subjecting the batch contained in the cavity of the first section to the action of the heating means for raising the temperature thereof up to bringing the batch into a liquid or semi-liquid state, the first section being located at a distance from the second section of female part; successively inserting, in mutual contact, the first section in the second section of female part, the batch being in the liquid or semi-liquid state, and subjecting the female part to the penetration of the male part internally of the relative forming chamber, for forming the object. a female part having a matrix cavity and at least a male part destined to penetrate the matrix cavity in order to define a forming chamber, in which the female part comprises two complementary and mutually-couplable sections, in which: a first section has a first cavity, which wholly or partly defines the matrix cavity of the female part, destined to contain a batch of material and has walls (11, 12) which are relatively slim; a second section is destined to complementarily contain the first section, and adhere at least partly to the external surface (11 a, 12a) of the first section, the second section having a structure which is substantially undeformable under forming pressures and being destined, by adhesion thereof with the first section, to render the matrix cavity non-deformable when subjected to forming pressure, the two sections (10, 20) being operatively separable and distanceable from one another and defining, when reciprocally coupled, a single female part of die and further making use of a heating means, separate and located at a distance from the second section of female part, a first section has a first cavity, which wholly or partly defines the matrix cavity of the female part, destined to contain a batch of material and has walls (11, 12) which are relatively slim; a second section is destined to complementarily contain the first section, and adhere at least partly to the external surface (11 a, 12a) of the first section, the second section having a structure which is substantially undeformable under forming pressures and being destined, by adhesion thereof with the first section, to render the matrix cavity non-deformable when subjected to forming pressure, the two sections (10, 20) being operatively separable and distanceable from one another and defining, when reciprocally coupled, a single female part of die and further making use of a heating means, separate and located at a distance from the second section of female part, the method being characterised in that it comprises: completely extracting and distancing the first section from the second section of female part, inserting a batch of material internally of the cavity of the first section, subjecting the batch contained in the cavity of the first section to the action of the heating means for raising the temperature thereof up to bringing the batch into a liquid or semi-liquid state, the first section being located at a distance from the second section of female part; successively inserting, in mutual contact, the first section in the second section of female part, the batch being in the liquid or semi-liquid state, and subjecting the female part to the penetration of the male part internally of the relative forming chamber, for forming the object. completely extracting and distancing the first section from the second section of female part, inserting a batch of material internally of the cavity of the first section, subjecting the batch contained in the cavity of the first section to the action of the heating means for raising the temperature thereof up to bringing the batch into a liquid or semi-liquid state, the first section being located at a distance from the second section of female part; successively inserting, in mutual contact, the first section in the second section of female part, the batch being in the liquid or semi-liquid state, and subjecting the female part to the penetration of the male part internally of the relative forming chamber, for forming the object.