Objective To analyze the role of tidal breathing pulmonary function test in clinical diagnosis and treatment of children with bronchial pneumonia. Methods A total of 43 children with bronchopneumonia admitted to our hospital from August 2021 to August 2022 were selected as the research objects, and they were taken as the observation group. At the same time, 35 healthy infants and young children who underwent tidal breathing pulmonary function test in our hospital during the same period were included as the control group. The tidal breathing pulmonary function test was tested and the lung function parameters of the two groups were compared. Results There was no significant difference in tidal volume between the two groups (P>0.05). The respiratory ratio, peak volume ratio, peak time ratio, respiratory flow rate 25%, respiratory flow rate 50 % and respiratory flow rate 75% in the observation group were lower than those in the control group, and the respiratory frequency was higher than that in the control group, the differences were statistically significant (P<0.05). Conclusion Tidal breathing pulmonary function test is a good adjunct to the diagnosis of bronchopneumonia in children, does not require other auxiliary cooperation from the child, and is highly accepted by patients and their families, so it is worth promoting its use in clinical good.