In order to study the influence of rotary forging deformation amount on the performance of vanadium-based hydrogen storage alloy for vehicle battery, the rotary-forging tests on V3TiNi0.56Cr0.3 vanadium-based hydrogen storage alloy for vehicle battery were conducted using five different rotary forging deformation amounts, and the corrosion resistance performance and the stability of charge-discharge cycles were tested and compared. The results show that the rotary forging deformation amount has a significant impact on the corrosion resistance performance and the stability of charge-discharge cycles for V3TiNi0.56Cr0.3 vanadium-based hydrogen storage alloy specimens. As the rotary forging deformation amount increases, the corrosion potential of alloy specimens in sodium hydroxide solution at room temperature first shifts positive and then negative, and the discharge capacity attenuation of alloy after 5000 charge-discharge cycles gradually decreases and then increases. The corrosion resistance performance and the stability of charge-discharge cycles of alloy both increase first and then decrease. Compared with the specimen with the rotary forging deformation amount of 10%, when the rotary forging deformation amount is 25%, the corrosion potential of the alloy specimen shifts 82 mV positively, and the discharge capacity attenuation decreases by 40.7%. It is concluded that the optimal rotary forging deformation amount of V3TiNi0.56Cr0.3 vanadium-based hydrogen storage alloy specimen is 25%.