The work aims to study the load-carrying capacity and the nonlinear buckling variation law of outrigger structures of the new type of heavy duty fiber molding pallet. The nonlinear buckling of outrigger structures of the designed heavy duty fiber molding pallet under compressive loading was simulated by writing the Ansys APDL program, based on the parameters of the prepared fiber molding material. The deviation of ultimate load values obtained from the Anays simulation and experiments was less than 5.2%, which showed a good simulation accuracy. In the process of buckling of outrigger structure of the heavy duty fiber molding pallet, four stages (elastic stage, strengthening stage, buckling deformation stage and stress failure stage) were found for the maximum stress-strain change. The stresses at buckling deformation stage for outrigger structures of different diameters remained at about 12.69 MPa, which was lower than the ultimate strength of the material. Carrying capacity of outrigger structure after the buckling deformation stage was enhanced by increasing the wall thickness or draft angle. The ultimate load of outrigger structure was in-creased by increasing the wall thickness or reducing the draft angle. The molding process and excellent bearing performance of the outrigger structure could be achieved when the draft angle was 1.5° to 2.0° and the fillet radius was 9mm to 15 mm. The ultimate load and the wall thickness & draft angle of the outrigger have excellent linear goodness of fit. The ultimate bearing capacity of outrigger structure can be predicted based on the wall thickness or draft angle.