Objective To summarize the effect of cognitive intervention on children's vaccination. Methods The family members of children vaccinated with DPT vaccine in Qishi Town of Dongguan City from May to September 2018 were divided into control group 254 and experimental group 248 according to the sequence of vaccination time. The family members of control group were vaccinated by routine methods. On the basis of routine vaccination, the experimental group carried out a variety of preventive knowledge and adverse reactions observation of DPT vaccine to the family members of children in combination with the problems of untimely vaccination and delayed vaccination. The knowledge propaganda and training intervention of treatment and vaccination precautions were summarized. The situation of two groups of children in timely vaccination, delayed vaccination, vaccination knowledge, adverse reaction performance and treatment, knowledge of vaccination precautions and service satisfaction were summarized. Results The vaccination rate of children in the experimental group was higher than that in the control group, and the delayed vaccination rate was lower than that in the control group. The results showed statistical difference (P＜0.05). The knowledge of vaccination, adverse reactions, treatment and matters needing attention of family members were higher than that in the control group, and the results showed statistical difference (P＜0.05). Conclusion Implementing cognitive intervention management of family vaccination may improve family members'knowledge of vaccination and nursing of adverse reactions, improve children's vaccination rates and timely vaccination rates, and improve the management effect of vaccination service.