Objective To explore the correlation between helicobacter pylori infection and children allergic purpura disease and its prognosis, and provide some basis for clinical diagnosis and treatment. Methods A total of 90 children with allergic purpura who were treated in our hospital from December 2016 to Feb 2018 were randomly selected as observation group. 90 healthy children who were admitted to our hospital for physical examination during the same period were selected as the control group, and the Hp infection in the two groups was compared. According to Hp infection and treatment, the observation group was divided into three groups: A, B and C, among which group A (29 cases) was Hp (-) group, and routine treatment was performed.Group B (31 cases) were Hp (+) group, and routine treatment was performed. group C (30 cases) were Hp (+) group, and conventional treatment combined with anti-hp treatment were performed. We compared three groups of .curative effects. Results The positive rate of Hp infection in the observation group was higher than that in the control group, and the difference was statistically significant (P<0.05).The positive rate of Hp infection in HSP patients with abdominal symptoms was higher than that in HSP patients without abdominal symptoms, and the difference was statistically significant (P<0.05). The effective rate of treatment in group B was significantly lower than that in group A, and the effective rate of treatment in group C was higher than that in group B, and the difference was statistically significant (P<0.05). Conclusion Hp infection may be one of the causes of HSP, and its abdominal symptoms are closely related to Hp, and the eradication of Hp treatment would improve the prognosis of HSP patients.