For the 2A14 large-sized aluminum alloy conical cylindrical shell forgings, aiming at the problems of poor quality consistency of free forging products, uncontrollable cycle costs, large projection area of the conical cylindrical shell during die forging, high equipment load requirements and difficulty in demolding after die forging, the above problems were solved by using expanding-extrusion compound forming process and the structural design of composite ejection die, and the the low-load forming and non-skin die forging forming were achieved. Then, based on software DEFORM-3D, the temperature field, strain field and forming load in the forming process were simulated and analyzed, and the defects in the die forging forming process were analyzed and predicted. The results show that in the actual product verification process, the forming load is significantly reduced, and the forgings are demolded smoothly. The application of expanding-extrusion compound forming technology makes the die forgings fully filled and free from folding defects. Comparision of different forming schemes shows that the expansion-extrusion compound forming scheme has certain advantages in production cycle, manufacturing cost and quality of forgings.