This study aims to determine the implementation of the Convention on the Rights of the Child regarding the prevention of child marriage based on West Nusa Tenggara Province Regional Regulation Number 5 of 2021 concerning the Prevention of Child Marriage. This research is a Normative, Empirical, legislative, and conceptual approach, and a sociological approach. Types and sources of legal materials: primary, secondary, and tertiary legal materials. The technique of collecting legal materials uses document studies with the stages of inventory, systematization, synchronization, and harmonization of various related legal materials. The implementation of child marriage prevention requires quite comprehensive strategies, based on Article 6, Paragraph 1 of NTB Regional Regulation Number 5 of 2021. The Child Marriage Prevention Strategy can be carried out in 2 ways: Prevention of child marriage through the Court and Prevention efforts in the community. Prevention efforts need to continue to be carried out by involving all elements of society so that child marriage can be minimized, given its detrimental impact in various aspects, including the economy, health, education, and other children's freedoms. The Central Lombok District Government has shown progress in efforts to prevent child marriage, especially since the enactment of Regional Regulation No. 5 of 2021. Supporting factors include the Village Regulation, socialization, the establishment of the Children's Forum and PATBM, and increased community awareness. Meanwhile, the main obstacles include Merariq culture, economic factors, religious views, environmental and media influences, and low education. So that synergy between elements of society is needed to strengthen the implementation of local regulations and post-child marriage assistance, the government must be present in providing better assistance.