AIMS: Polycystic ovary syndrome (PCOS) is closely associated with metabolic disorders such as insulin resistance and obesity, but the role of adipogenesis in its pathophysiology remains unclear. This study investigates the role of adipogenesis in PCOS development and evaluates whether hyperoside (HPS), an anti-adipogenic herbal compound, can improve PCOS by inhibiting adipogenesis. MAIN METHODS: A combination of in vivo and in vitro models was used to assess the impact of HPS on ovarian function, insulin resistance, and adipogenesis. PCOS mice were treated with HPS, and their ovarian function and insulin resistance were evaluated. In vitro adipocyte differentiation assays were conducted to examine the effects of HPS on adipogenesis. The target of HPS was analyzed by Surface plasmon resonance. The expression levels of NCOA2 and PPAR-γ ubiquitination and degradation were analyzed using quantitative real-time PCR and Western blotting. Additionally, NCOA2 knockdown experiments were performed to investigate its role in ovarian function, insulin resistance, and adipogenesis in PCOS mice. KEY FINDINGS: HPS treatment significantly improved ovarian function, reduced insulin resistance, and suppressed adipogenesis in PCOS mice. Mechanistically, HPS inhibited adipogenesis by reducing NCOA2 expression, thereby preventing PPAR-γ ubiquitination and degradation. Knockdown of NCOA2 further validated its role by improving ovarian function, insulin resistance, and adipogenesis in PCOS models. SIGNIFICANCE: These findings demonstrate that HPS alleviates PCOS by regulating NCOA2-mediated PPAR-γ ubiquitination and degradation, offering new insights into the role of adipogenesis in PCOS pathophysiology.