Alveolar corrugated cardboard panel in the construction of load-bearing structures, complete buildings or part of them such as walls, partitions, ceilings, wall plugs, roofs, expositors and others, said alveolar panel comprising: an external layer composed by a box-shaped element of corrugated cardboard which has a rectangular elongated section and open opposite extremities; a middle layer composed by a block of some tube-shaped elements of corrugated cardboard which have a square or a rectangular section and are open at the opposite extremities, that are firmly connected to each other side by side and surrounded by tapes, said block of tube-shaped elements has the same height of said external layer and is configured to be positioned inside of it; an internal layer composed by tube-shaped elements ( 13, 13', 13'') of corrugated cardboard with a cross section smaller than the cross section of the said tube-shaped elements of said middle layer, the height of said internal layer tube-shaped elements ( 13, 13', 13'') is at least 1/3 of the height of said block of tube-shaped elements of said middle layer and are configured to be positioned inside of it in alternate position, while they are mutually jointed to entirely fill the height of said alveolar panel in other outermost and intermediate positions by jointing wood elements ( 24, 25); a series of hollow gaps inside of the elements of said middle layer and said internal layer ( 13, 13', 13"), which can be filled by some various melted materials, foam or sheets, also cardboard or other materials, to enhance the thermal-acoustic and mechanical properties, the final weight or other properties of said alveolar panel; a couple of closing wood boards ( 21, 21'), one positioned at the top and the other at the bottom of said alveolar panel with the presence of some wood connectors ( 22, 23) which have two different sizes to be allocated inside said tube-shaped elements of corrugated cardboard of said middle layer and said internal layer ( 13, 13', 13"). an external layer composed by a box-shaped element of corrugated cardboard which has a rectangular elongated section and open opposite extremities; a middle layer composed by a block of some tube-shaped elements of corrugated cardboard which have a square or a rectangular section and are open at the opposite extremities, that are firmly connected to each other side by side and surrounded by tapes, said block of tube-shaped elements has the same height of said external layer and is configured to be positioned inside of it; an internal layer composed by tube-shaped elements ( 13, 13', 13'') of corrugated cardboard with a cross section smaller than the cross section of the said tube-shaped elements of said middle layer, the height of said internal layer tube-shaped elements ( 13, 13', 13'') is at least 1/3 of the height of said block of tube-shaped elements of said middle layer and are configured to be positioned inside of it in alternate position, while they are mutually jointed to entirely fill the height of said alveolar panel in other outermost and intermediate positions by jointing wood elements ( 24, 25); a series of hollow gaps inside of the elements of said middle layer and said internal layer ( 13, 13', 13"), which can be filled by some various melted materials, foam or sheets, also cardboard or other materials, to enhance the thermal-acoustic and mechanical properties, the final weight or other properties of said alveolar panel; a couple of closing wood boards ( 21, 21'), one positioned at the top and the other at the bottom of said alveolar panel with the presence of some wood connectors ( 22, 23) which have two different sizes to be allocated inside said tube-shaped elements of corrugated cardboard of said middle layer and said internal layer ( 13, 13', 13").