Objective To investigate the correlation between pulmonary function and different imaging types in children with mycoplasma pneumoniae pneumonia (MPP). Methods A total of 120 children with MPP treated in our hospital from May 2023 to February 2025 were selected. According to the results of lung CT examination, they were divided into bronchopneumonia group (n=57), lobar pneumonia group (n=41) and bronchiolitis group (n=22). The clinical data and pulmonary function indexes of the three groups were compared and analyzed, and the correlation between different imaging types and pulmonary function was analyzed by Spearman correlation. Results There were significant differences in tidal volume (VT), forced vital capacity (FVC), forced expiratory volume in one second(FEV1), peak expiratory flow (PEF), forced expiratory flow at 25% of the pulmonary volume (FEF25), forced expiratory flow at 50% of the pulmonary volume (FEF50), forced expiratory flow at 75% of the pulmonary volume (FEF75) and maximum mid-expiratory flow (MMEF) among the three groups (P＜0.05). Bronchopneumonia was positively correlated with VT, FVC, FEV1, FEF25, FEF75 and MMEF (P＜0.05), and negatively correlated with PEF (P＜0.05). Lobar pneumonia was positively correlated with PEF (P＜0.05) and negatively correlated with MMEF (P＜0.05). Bronchiolitis was negatively correlated with VT, FVC, FEV1, FEF25, FEF50, FEF75 and MMEF (P＜0.05).Conclusion The different imaging features of children with MPP are closely related to the pulmonary function indexes