Modular structure for a cardboard tower-like display, made up of horizontally separated shelves and corner columns which support such shelves, comprising: - shelves modules (a), each of which features a cardboard sheet having a four-sided central area, wherein the corners form incoming vertexes and the sides are fold lines linked to the respective flaps thereof, which have first sections with consecutive parallel fold lines which capable of forming projected tubular edges, and second sections which, as a whole, make up a wall with a surface equal to the central part of the sheet and on which it may be overlapped, each flap having reciprocal anchoring elements with such central part of the sheet; - straight tubes which comprise stud modules (b) which are part of each column of equal length than the perimeter tubular edges of each shelf; and - hub-shaped connecting elements (c), each of which has a central part with arms, projected into three spatial orthogonal directions which fit the concurrent ends of the tubular edges of each shelf module (a), and the respective ends of the tubes which make up the stud modules (b); and it is characterized in that: - in the sheet which makes up each shelf modules (a), the second sections of two opposite flaps are trapezoidal and the second sections of the two other opposite flaps are trapezoidal with their respective rectangular prolongations, the latter four second sections forming a quadrilateral whose surface is equal to the central area of the sheet; - the reciprocal anchoring elements comprise rectangular flaps with a pair of retention protrusions on the side, which are built from the respective "U" shaped dies which coincide with the fold lines between the first and second section (14b-14c) in each flap, and straight slots corresponding to each flap, wherein each slot shows the same length than each flap and where such slots are formed in the central area of the sheet, coinciding with the virtual line which defines the contour of such central area; and wherein - each connecting element (c) module in the shape of a corner hub comprises a central part with three orthogonal arms (31, 32, 33) within a same virtual plane, in a letter "T" shape, and a fourth arm which features a perpendicular axis to such virtual plane, with one of the ends having reciprocal fixation means to the central part. - shelves modules (a), each of which features a cardboard sheet having a four-sided central area, wherein the corners form incoming vertexes and the sides are fold lines linked to the respective flaps thereof, which have first sections with consecutive parallel fold lines which capable of forming projected tubular edges, and second sections which, as a whole, make up a wall with a surface equal to the central part of the sheet and on which it may be overlapped, each flap having reciprocal anchoring elements with such central part of the sheet; - straight tubes which comprise stud modules (b) which are part of each column of equal length than the perimeter tubular edges of each shelf; and - hub-shaped connecting elements (c), each of which has a central part with arms, projected into three spatial orthogonal directions which fit the concurrent ends of the tubular edges of each shelf module (a), and the respective ends of the tubes which make up the stud modules (b); - in the sheet which makes up each shelf modules (a), the second sections of two opposite flaps are trapezoidal and the second sections of the two other opposite flaps are trapezoidal with their respective rectangular prolongations, the latter four second sections forming a quadrilateral whose surface is equal to the central area of the sheet; - the reciprocal anchoring elements comprise rectangular flaps with a pair of retention protrusions on the side, which are built from the respective "U" shaped dies which coincide with the fold lines between the first and second section (14b-14c) in each flap, and straight slots corresponding to each flap, wherein each slot shows the same length than each flap and where such slots are formed in the central area of the sheet, coinciding with the virtual line which defines the contour of such central area; and wherein - each connecting element (c) module in the shape of a corner hub comprises a central part with three orthogonal arms (31, 32, 33) within a same virtual plane, in a letter "T" shape, and a fourth arm which features a perpendicular axis to such virtual plane, with one of the ends having reciprocal fixation means to the central part.