Assembly process of a telescopic tower including at least one prefabricated concrete section, comprising a base section and a plurality of superimposed sections (2, 4, 6, 8), wherein the diameter of said base section is greater than the diameter of said superimposed sections (2, 4, 6, 8), characterized in that it comprises the following steps: a) providing said sections (2, 4, 6, 8, 10) in an initial position wherein said base section is vertically disposed resting on an assembly surface and said superimposed sections (2, 4, 6, 8) are disposed coaxially within said base section; b) providing assembly means (14, 16, 18) capable of selectively lifting said superimposed sections (2, 4, 6, 8); c) providing operator support means on the external surface of said base section essentially vertically in correspondence with the upper edge of said base section; d) lifting the innermost superimposed section (2, 4, 6, 8) radially from those that are in the initial position, by said assembly means (14, 16, 18), to an assembly position wherein the lower end portion of said superimposed section (2, 4, 6, 8) which is being lifted is situated essentially vertically in correspondence with the upper end portion of the radially external and immediately adjacent section (4, 6, 8, 10) in relation to said section (2, 4, 6, 8) which is being lifted, thus forming a joint between the lower end portion of said superimposed section (2, 4, 6, 8) which is being lifted and the upper end portion of the radially external and immediately adjacent section (4, 6, 8, 10) in relation to said section (2, 4, 6, 8) which is being lifted, said joint being thus situated essentially vertically in correspondence with said operator support means; e) providing in said joint anchoring devices for immobilizing at least provisionally the corresponding sections (2, 4, 6, 8, 10) between one another, by operators housed in said operator support means; f) repeating steps d) and e) at least once. a) providing said sections (2, 4, 6, 8, 10) in an initial position wherein said base section is vertically disposed resting on an assembly surface and said superimposed sections (2, 4, 6, 8) are disposed coaxially within said base section; b) providing assembly means (14, 16, 18) capable of selectively lifting said superimposed sections (2, 4, 6, 8); c) providing operator support means on the external surface of said base section essentially vertically in correspondence with the upper edge of said base section; d) lifting the innermost superimposed section (2, 4, 6, 8) radially from those that are in the initial position, by said assembly means (14, 16, 18), to an assembly position wherein the lower end portion of said superimposed section (2, 4, 6, 8) which is being lifted is situated essentially vertically in correspondence with the upper end portion of the radially external and immediately adjacent section (4, 6, 8, 10) in relation to said section (2, 4, 6, 8) which is being lifted, thus forming a joint between the lower end portion of said superimposed section (2, 4, 6, 8) which is being lifted and the upper end portion of the radially external and immediately adjacent section (4, 6, 8, 10) in relation to said section (2, 4, 6, 8) which is being lifted, said joint being thus situated essentially vertically in correspondence with said operator support means; e) providing in said joint anchoring devices for immobilizing at least provisionally the corresponding sections (2, 4, 6, 8, 10) between one another, by operators housed in said operator support means; f) repeating steps d) and e) at least once.