The invention discloses a cardboard bearing bracket with an optimized structure. The cardboard bearing bracket includes a rectangular bearing tray, the four corners of the bottom surface of the bearing plate are fixedly connected with wheels, a plurality of transverse binding mechanisms are fixed on the bottom surface of the bearing tray, each binding mechanism comprises horizontal C-shaped groovesteel, a U-shaped groove is formed in the side wall of each C-shaped groove steel, a limiting plate is inserted and connected to each C-shaped groove steel, the two sides of each limiting plate are fixed on the side wall of the corresponding C-shaped groove steel between two channels of the corresponding U-shaped groove, a longitudinal permanent magnet guide post on which an elastic rope belt isfixed is inserted and connected to the lower end of each U-shaped groove, the elastic rope belt is fixed on an axle sleeve bypassing the corresponding limiting plate, the axle sleeves are inserted into the C-shaped groove steel and distributed at the upper ends of the axle sleeves correspondingly, a T-shaped permanent magnet pin is inserted and connected to the U-shaped groove on one side of the C-shaped groove steel by passing through the U-shaped groove and the axle sleeve on one side of the C-shaped groove steel correspondingly; and the axle sleeves rest against the permanent magnet guide posts through suction correspondingly. According to the invention, the binding mechanisms are arranged at the bottom of the bearing tray, cardboards stacked on the bearing tray can be bound by using the binding mechanisms, so that the cardboards cannot be dumped during the cardboard conveying process.