An installation system for partition panels for a room that includes a ceiling and a floor, wherein the system comprises in combination: at least one upper telescopic group, produced with sections and suitable to be arranged constrained to the plane of the ceiling, and at least one lower telescopic group, produced with sections and suitable to be arranged constrained to the plane of the floor respectively; a series of partition panels positioned between said upper and lower telescopic group (GTS, GTI) with the interpositioning of coupling-uncoupling groups (32,33); wherein both said at least one upper telescopic group and said lower telescopic group comprise respectively a first section (12,13) and a second section (22,23) that are destined for being internally coupled with each other, wherein said second section (22, 23) is slidingly arranged internally with respect to the first section (12,13) and is adjustable in position with respect to the same, once said first section (12,13) has been fixed to the plane of the ceiling and to the plane of the floor respectively; characterized in that each of said coupling-uncoupling groups comprises a first female coupling element and a second male coupling element that are connected, one to said second section (22,23) and the other to said partition panel and can be engaged with each other in rotation by means of releasable constraint means (37,38,40,42), said first section (12,13) and a second section (22,23) are U-shaped in cross section and said first section (12,13) in a central portion connecting the two sides of the U, within the section, has and carries a longitudinal shaped housing with curved ends, slidingly receiving in its interior plates carrying and axially constraining, free to rotate, externally threaded pins, which protrude perpendicular to each plate and are inserted in threaded holes produced in a solid central portion of said second section (22,23), wherein said first female coupling element is fixed by means of fixing screws within seats of the second section (22, 23) forming part of the respective telescopic coupling group (GTS, GTI). at least one upper telescopic group, produced with sections and suitable to be arranged constrained to the plane of the ceiling, and at least one lower telescopic group, produced with sections and suitable to be arranged constrained to the plane of the floor respectively; a series of partition panels positioned between said upper and lower telescopic group (GTS, GTI) with the interpositioning of coupling-uncoupling groups (32,33); wherein both said at least one upper telescopic group and said lower telescopic group comprise respectively a first section (12,13) and a second section (22,23) that are destined for being internally coupled with each other, wherein said second section (22, 23) is slidingly arranged internally with respect to the first section (12,13) and is adjustable in position with respect to the same, once said first section (12,13) has been fixed to the plane of the ceiling and to the plane of the floor respectively; characterized in that each of said coupling-uncoupling groups comprises a first female coupling element and a second male coupling element that are connected, one to said second section (22,23) and the other to said partition panel and can be engaged with each other in rotation by means of releasable constraint means (37,38,40,42), said first section (12,13) and a second section (22,23) are U-shaped in cross section and said first section (12,13) in a central portion connecting the two sides of the U, within the section, has and carries a longitudinal shaped housing with curved ends, slidingly receiving in its interior plates carrying and axially constraining, free to rotate, externally threaded pins, which protrude perpendicular to each plate and are inserted in threaded holes produced in a solid central portion of said second section (22,23), wherein said first female coupling element is fixed by means of fixing screws within seats of the second section (22, 23) forming part of the respective telescopic coupling group (GTS, GTI).