Objective To investigate the CT images of patients with pulmonary tuberculosis complicated with lung cancer and provide reference for the diagnose. Methods 50 cases of pulmonary tuberculosis and lung cancer treated in our hospital in 2015~2018 in January were selected as observation group, and 50 cases of simple pulmonary tuberculosis treated in our hospital for the same period were selected as control group. The clinical symptoms and CT imaging findings of the two groups were observed and compared. Results There was no significant difference in clinical symptoms and signs between the two groups (P>0.05), and the proportion of lobular sign and burr nodular nodules in the observation group was higher than that of the control group (P<0.01), and the proportion of parenchymal cavities in the observation group was lower than that of the control group (P<0.01). There was no significant difference between the two groups in the incidence of tumor and streak shadow (P>0.05). Conclusion The CT imaging features of patients with pulmonary tuberculosis and lung cancer are mainly lobular sign, burr like nodules and cavities, which should be qualitatively diagnosed according to these features combined with other tests.