Vanadium-based compounds have been extensively studied as promising cathode materials for zinc-ion batteries, due to their multiple valence states and tunable ion-diffusion pathways. Nevertheless, the sluggish kinetics of Zn-ion intercalation and the comparatively unstable layered structure remain major hurdles that limit their further advancement. The preinsertion of an appropriate amount of K+ can function as a pillar to expand the interlayer distance, alleviate irreversible deammoniation, and reinforce structural stability. Consequently, the K−NVO cathode achieves a high specific capacity of 460 mAh g−1 at 0.2 A g−1 and demonstrates superior cyclic stability, with 94% of its initial capacity retained after 2000 cycles. By tackling the critical issues of material stability and electrochemical performance, this achievement brings AZIBs closer to practical application.