Objectives. To analyze the application of childlike concept with refined nursing intervention in the treatment of children with severe pneumonia. Methods. 100 cases of children with severe pneumonia admitted to our hospital from June 2019 to June 2021 were selected and divided into the control group and the observation group, in which the control group was given refined nursing care and the observation group was given the childlike concept with refined nursing intervention to compare the treatment effects of patients in both groups. The clinical indexes such as recovery time of body temperature, disappearance time of pulmonary rales, recovery time of heart rate, disappearance time of cough, and hospitalization time, were compared between the two groups. Results. Compared with the control group, the time to recovery of body temperature, time to disappearance of pulmonary rales, time to recovery of heart rate, time to disappearance of cough, and hospitalization time were significantly lower in the observation group, and the difference was statistically significant (
P
<
0.05
). Compared with the control group, the compliance rate of patients in the observation group was significantly lower, and the difference was statistically significant (
P
<
0.05
). Compared with the control group, the total effective rate of patients in the observation group was significantly higher, and the difference was statistically significant (
P
<
0.05
). Compared with the control group, the overall satisfaction rate of patients in the observation group was significantly higher, and the difference was statistically significant (
P
<
0.05
). The results of univariate analysis showed that the differences between the two groups were statistically significant (
P
<
0.05
) in terms of economic conditions, payment method, child’s condition, child’s age, comorbid underlying diseases, and nursing care method, and the results of logistic multifactor regression analysis showed that the payment method of self-payment, child’s critical condition, and comorbid underlying diseases were the most important factors affecting the anxiety of the family members of children with severe pneumonia. risk factors for the occurrence of anxiety in the families of children with severe pneumonia, and the method of care was a protective factor (
P
<
0.05
). Conclusion. The concept of childlike fun and refined nursing interventions can effectively improve the treatment effect of children with severe pneumonia, improve patients’ condition, increase patients’ compliance and satisfaction, and reduce the risk of anxiety and other negative emotions of the child’s family members.