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Background: Inflammation can result in the development of breast cancer in women with overweight and obese, and also affects the outcome and prognosis of breast cancer patients, thereby decreasing the cure and survival rates of breast cancer patients. Exercise may benefit breast cancer patients as a supplement to conventional treatments. However, research on the effects of exercise on inflammatory markers in women with breast cancer who are overweight and obese remains incomplete. Objective: A systematic review and meta-analysis were used to study the effects of exercise on inflammatory markers in women with breast cancer who are overweight and obese. Method: Literature up to May 2024 was searched from databases such as Cochrane, Embase, Pubmed, Web of Science, and EBSCO, and English-language randomized controlled trials (RCTs) that met the inclusion criteria were screened. The screening criteria were as follows (A) written in English; (B) RCT; (C) studied in women with overweight obese and breast cancer; (D) outcome measures: inflammatory markers; (E) the duration of the exercise intervention was unlimited. Results: A total of 14 articles and 1064 participants were included. Exercise significantly reduced C-reactive protein (CRP) (MD: −0.52, 95 % CI: −0.94 to −0.11; p = 0.01; heterogeneity p