Objective To analyze the clinical value of chest CT in the diagnosis of 98 children with mycoplasma pneumoniae pneumonia (MPP). Methods The clinical data the results of chest CT of 98 children with MPP diagnosed in our hospital from March 2014 to February 2016 were analyzed retrospectively. Results Among 64 cases of unilateral lung lesions, lesions confined to the right side were more than the left side (44 cases vs 20 cases). The multi-lobe lesions were significantly more than single-lobe lesions (62 cases vs 34 cases), and among multi-lobe lesions, cases of right lower lobe involvement were the most (32 cases). Cases with massive consolidation shadows (79.59%) were significantly more than cases with other imaging lesions. The imaging lesions mainly included mottling and patchy solid shadows (32.65%), pleural effusion (25.51%), atelectasis (20.41%), scattered patchy shadows (13.27%) and lung hilar lymph node enlargement (12.24%). Infants mainly showed scattered and patchy shadows and lung atelectasis, while children mainly showed large-area solid change shadows, mottling and patchy shadows, complicated with pleural effusion. Conclusion Chest CT findings of children with MPP are characteristic and are different in different age groups. Chest CT diagnosis is helpful for early diagnosis and treatment of MPP in children of different ages.