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Perovskite solar cells suffer from poor reproducibility due to the degradation of perovskite precursor solution. Herein, we report an effective precursor stabilization strategy via incorporating 3‐hydrazinobenzoic acid (3‐HBA) containing carboxyl (−COOH) and hydrazine (−NHNH₂) functional groups as stabilizer. The oxidation of I⁻, deprotonation of organic cations and amine‐cation reaction are the main causes of the degradation of mixed organic cation perovskite precursor solution. The −NHNH₂ can reduce I₂ defects back to I⁻ and thus suppress the oxidation of I⁻, while the H⁺ generated by −COOH can inhibit the deprotonation of organic cations and subsequent amine‐cation reaction. The above degradation reactions are simultaneously inhibited by the synergy of functional groups. The inverted device achieves an efficiency of 23.5 % (certified efficiency of 23.3 %) with an excellent operational stability …