Background: Antimicrobial resistance is one of the most significant challenges of the twenty-first century, and the illegal sale of antimicrobial drugs at community pharmacies is a driver of antimicrobial resistance. This study explores the knowledge, attitudes, and practices (KAP) of pharmacy staff toward antimicrobial stewardship programs (ASPs). Methods: We conducted a descriptive cross-sectional study among community pharmacy staff in Northeastern China, from April 1 to 31 May 2019, using a self-administered KAP questionnaire comprising 20 items. The data analysis was carried out by employing Mann-Whitney and Kruskal-Wallis tests. Results: A response rate of 98.5% (394/400) was obtained. The majority of participants (94.9%) demonstrated a good understanding of antimicrobial use, but they lacked an adequate understanding of ASPs. Nearly half of the participants (40.6%) reported that they sold antimicrobials to patients without a prescription. Education level, age, occupation, and experience were all significantly associated (P < 0.05) with participants' median ASPs scores. Besides, the presence of a licensed pharmacist (OR 46.327, 95% CI 2.443-878.451, P = 0.011) was the main factor associated with the pharmacy staff's understanding of antimicrobial use policies. Conclusions: The participants' knowledge of antimicrobials was good, and their attitudes regarding ASPs were positive, but their practices regarding ASPs were poor.