Objective To investigate accurate degree of multi-slice ct scanning and image handling technology on diagnosis of foreign bodies in airway in children. Methods 78 cases with foreign bodies in airway in outpatient service in our hospital from July 2016 to July 2017 were selected and divided into two groups according to throwing method, 39 cases given X-ray examination were seen as control group, 39 cases given CT examination were seen as observation group, foreign body coincidence rate and misdiagnosis rate of two groups were compared. Results In control group, Ⅰtype 8 cases(20.51%), Ⅱtype 10 cases(25.64%), Ⅲ type 8 cases(20.51%), coincidence 26 cases(66.67%). In observation group, Ⅰtype 10 cases(25.64%), Ⅱ type 13 cases(33.33%), Ⅲ type 14 cases(35.90%), coincidence 37 cases(94.87%), the difference was statistic significant(P<0.05), there were 14 cases (35.90%) misdiagnosed in control group and 2 cases (5.13%) in observation group, the difference was statistic significant (P<0.05). Conclusion Multislice ct scanning has higher accuracy rate on diagnosis of foreign bodies in airway in children compared with X-ray examination, it can be seen as an important detection method and is worthy of wide application.