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Objective: To investigate the impact of preoperative hysteroscopy on progression‐free survival (PFS) and disease‐specific survival (DFS), and to explore the factors which contribute to poor clinical outcomes between hysteroscopy and dilation and curettage (D&C) in endometrial cancer (EC). Methods: A retrospective study was designed by collecting data from women diagnosed with EC through hysteroscopy or D&C from January 2010 to December 2019 in a tertiary hospital in China. A propensity score was used for 1:1 matching of advanced stage patients. Univariate and multivariate analysis were conducted to determine whether hysteroscopy was a prognostic factor in EC and to identify factors associated with its impact on PFS and DFS in different subgroups. Results: Overall, 543 and 272 women who underwent D&C and hysteroscopy, respectively were included. Compared to D&C, preoperative hysteroscopy was related to reduced PFS and DFS, with a hazard ratio (HR) of 1.904 and 3.905, respectively. Hysteroscopy contributed to an increased risk of positive wash cytology (48.27% vs 24.13%), recurrence (48.28% vs 20.69%) and shorter PFS after matching in FIGO Stage I–IV EC, while there was no significance in positive ascites cytology (14.04% vs 13.45%), PFS and DFS in FIGO Stage I EC. Conclusions: Hysteroscopy was an independent predictive factor for poor prognosis in EC. Hysteroscopy appeared to be a safe diagnostic method as D&C in FIGO Stage I EC but was a risk factor for increased recurrence and reduced PFS in advanced stage disease. Its impact on DFS is uncertain. Synopsis: Preoperative hysteroscopy procedure was associated with increased risk of recurrence and shorter PFS in advanced endometrial cancer. [ABSTRACT FROM AUTHOR]