ZnSe is regarded as a promising anode material for energy storage due to its high theoretical capacity and environment friendliness. Nevertheless, it is still a significant challenge to obtain superior electrode materials with stable performance owing to the serious volume change and aggregation upon cycling. Herein, a willow‐leaf‐like nitrogen‐doped carbon‐coated ZnSe (ZnSe@NC) composite synthesized through facile solvothermal and subsequent selenization process is beneficial to expose more active sites and facilitate the fast electron/ion transmission. These merits significantly enhance the electrochemical performances of ZnSe@NC for sodium‐ion batteries (SIBs) and potassium‐ion batteries (PIBs). The obtained ZnSe@NC exhibits outstanding rate performance (440.3 mAh g⁻¹ at 0.1 A g⁻¹ and 144.4 mAh g⁻¹ at 10 A g⁻¹) and ultralong cycle stability (242.2 mAh g⁻¹ at 8.0 A g⁻¹ even after 3200 cycles) for SIBs. It is noted that 106.5 mAh g⁻¹ can be retained after 550 cycles and 71.4 mAh g⁻¹ is still remained after 1500 cycles at 200 mA g⁻¹ when applied as anode for PIBs, indicating good cycle stability of the electrode. The possible electrochemical mechanism and the ionic diffusion kinetics of the ZnSe@NC are investigated using ex situ X‐ray diffraction, high‐resolution transmission electron microscopy, and a series of electrochemical analyses.