This paper explores the impact of auditing firms on the implementation of the new Chinese Accounting Standards for Enterprises 22 (new CAS 22), which converges with IFRS 9. We find that the Big4 firms focus on fair value measurement and application of the expected credit loss (ECL) impairment model, whereas the LocalTop6 firms primarily focus on the classification of financial assets. The results indicate that effective implementation of the new standards mainly depends on standardized procedures and professional techniques of auditing firms, as the Big4 firms exhibit better implementation of the new standards in terms of items that generate greater risk and uncertainty than do local large auditing firms in China. In addition, we further test how cross‐listing affects the role of auditing firms in implementing the new standards and find that the Big4 firms play a more significant role for A‐share only companies than A + H companies. The findings reveal the challenges associated with implementation of IFRS 9‐based new CAS 22 in China.