For the problems of difficulty in controlling the spining forming accuracy and heat treatment deformation for spinning aluminum alloy thin-walled shell parts, the thin-walled shell part of 2A12 aluminum alloy was formed by the power spinning method, and the influences of H112 state and annealed state blanks on the forming were studied. Then, the influence laws of thinning ratio and feed rate on the diameter expansion amount in the forming process were analyzed, and the influences of feed rate and wall thickness of blank on the forming surface quality were studied. The test results show that the inner surface of 2A12 aluminum alloy in H112 state occurs cracks after spinning with the pass thinning ratio of 42.5%. When the thinning ratio increases from 15.6% to 42.5%, the diameter expansion amount decreases from 0.2 mm to 0.03 mm. When the thinning rate is 42.5%, the feed rate increases from 0.67 mm·r-1 to 0.8 and 1.0 mm·r-1, respectively, and the diameter expansion amount decreases from 0.12 mm to 0.06 and 0.01 mm, respectively. Thus, the aluminum alloy blank in H112 state is annealed at 380 ℃×1.5 h, and then subjected to multi-pass spinning. In the middle of spinning passes, the blank is subjected to stress relief annealing at 330 ℃×0.5 h, and finally the shell part is subjected to vacuum air cooling at 495 ℃×40 min. Thus, the ovality of workpiece is controlled within 0.12 mm, the tensile strength reaches 490-517 MPa, the elongation reaches 13.0%-15.5%, and the smoothness is 1.298-2.221 μm.