Children are the hope and future of the country, and doing an excellent job for children is of great importance to social development. Social work program efficiency assessment, can help service providers and program implementers understand the effectiveness of program implementation. For this reason, this study uses data envelopment analysis and the Tobit regression model to construct a child protection social work program efficiency assessment model. The input-output indicators of child protection program efficiency are selected. The model is used to analyze the input-output efficiency of social work child protection programs in City H from 2018-2021 as an example. The variables that affect the efficiency of child protection programs are explored in depth to explore the effective ways of child protection. The results show that the comprehensive technical efficiency, pure technical efficiency, and scale efficiency of the child protection program in 2018-2021 are all less than 1 and have not reached DEA efficiency. The comprehensive technical efficiency of the program is significantly affected by the scale efficiency, which necessitates an increase in resource investment in the child protection program. In addition, the six selected influencing factors are significant, at least at the 10% level, all of which positively affect the efficiency of child protection programs and need to be focused on to better improve the efficiency of social work services.