Cesium lead halide perovskite nanocrystals (NCs) have compelling photoelectric properties while their poor stability severely impedes their practical applications. Herein, we demonstrate novel CsPbBr-CsPbBrhomostructured NCs induced by a thioacetamide-oleylamine (TAA-OAm) ligand systemviaa facile room temperature re-precipitation method. The TAA-OAm ligand system could form long-chain N-substituted thioamides and short-chain Sligands, resulting in two different growth rates of CsPbBrNCs and finally forming CsPbBr-CsPbBrhomostructured NCs. The performed structural and compositional characterizations corroborate the existence of CsPbBr-CsPbBrhomostructured NCs. The obtained CsPbBr-CsPbBrhomostructures exhibit green emission of 510 nm and superior stability at room temperature in air. Our study provides a new approach to improve the stability of halide perovskite NCs, which may pave the way for future optoelectronic applications.