Objective To develop a reliable tool to assess pediatric asthma caregiver′s health belief on asthma attack prevention. Methods Based on the health belief model, the Questionnaire of Pediatric Asthma Caregiver′s Health Belief on Asthma Attack Prevention was developed through literature review, expert consultation, and pilot survey. Then 253 pediatric asthma caregivers from 2 women′s and children′s hospitals were conveniently selected for questionnaire survey. Results The final version of the questionnaire contained 5 dimensions (perceived susceptibility, perceived seriousness, self-efficacy, perceived barriers, perceived benefits) with 41 items. The Cronbach′s α coefficient was 0.947 for overall questionnaire, and 0.814 to 0.963 for the dimensions. Exploratory factor analysis extracted 5 factors, collectively contributing to a cumulative variance rate of 62.951%. The content validity index of the tool was 0.917. Conclusion The questionnaire enjoys good reliability and validity, rendering it a valid tool to assess caregivers′ health belief on their children′s asthma attack prevention.