Objective To explore the occurrence and risk factors of pulmonary infection(PI) after laparoscopic surgery for gastric cancer, and provide evidence for formulating prevention and control measures. Methods Clinical data of patients with gastric cancer who underwent laparoscopic surgery in a hospital between January 1, 2017 and December 31, 2018 were collected, risk factors that may affect post-operative PI were analyzed by univariate and multivariate logistic regression analysis. Results A total of 856 patients with gastric cancer who underwent laparoscopic surgery were analyzed, 113 patients had post-operative PI, incidence of post-operative PI was 13.20%. Univariate analysis showed that age, gender, smoking, stage of gastric cancer, number of underlying diseases, pulmonary insufficiency, pre-operative chemotherapy, and duration of post-operative indwelling gastric tube were risk factors for post-operative PI (all P<0.05). Multivariate logistic regression analysis showed that age, smoking, pulmonary insufficiency, and pre-operative chemotherapy were independent risk factors for post-operative PI (OR were 2.812, 3.578, 2.719, 2.115, all P<0.05). Conclusion Risk factors for PI after laparoscopic surgery for gastric cancer are age, smoking, pulmonary insufficiency and pre-operative chemotherapy, effective measures should be taken to reduce post-operative PI.