The invention discloses a super-large span variable section double-layer and three-layer prestressed rib beam type net rack and a making method. The super-large span variable section double-layer and three-layer prestressed rib beam type net rack comprises a net rack (1), wherein the net rack (1) consists of double layers of rightly placed quadrangular pyramid trusses (2), and three layers of rightly placed quadrangular pyramid trusses (3) are arranged at about one third position of each side of the net rack (1) in the x direction and the y direction; and prestressed steel cables (4) are arranged on the three layers of rightly placed quadrangular pyramid trusses (3). A novel structural form is provided for the field of super-large (L is more than or equal to 120m and less than or equal to180m) span space steel grid structures, the defect of over high consumption of steel for the conventional super-large span steel grid structure is overcome, the design requirements for 'safety, reasonability, advance and economy' are met, and the net rack is simple in construction and strong in operability; and compared with the conventional super-large span steel grid structure, the net rack hasthe advantages of greatly reducing the consumption of the steel and reducing the manufacturing cost of engineering.