Potassium ion batteries (PIBs) are identified as an imperative alternative for next-generation energy storage devices due to its abundant reserves. Even potassium (K) metal is a promising anode for its high theoretical capacity and intrinsic low potential, however, it still suffers from uncontrollable dendrite growth. Herein, a dendrite-free K anode is obtained by plating K metal on MoS₂-modified carbon cloth (MoS₂/CC@K). Specifically, MoS₂ undergoes a series of phase transitions from initial MoS₂ to K_xMoS₂ and final K₂S₄ with gradual insertion of K, then K metal is uniformly deposited on K₂S₄ with further discharging. This phase transition significantly reduces the K nucleation energy barrier. The strong interaction between K and K₂S₄ interface induces K in uniformly depositing to suppress the formation of K dendrites. Owing to these merits, the symmetric MoS₂/CC@K cells exhibit low voltage hysteresis and superior cycling stability. When paired with perylene-3,4,9,10-tetracarboxylic diimide (PTCDI) cathode, the full cells display superior rate capability and long lifespan (10,000 cycles). Additionally, this strategy is also performed on Li and Na metal anodes, the MoS₂/CC substrate still expresses superior electrochemical performance. This work provides a new view to induce the uniformly deposition of K, Li and Na metals.