— Diesel engines and heavy machinery sector demand for used with liquid fuel was an important tool for national development. Thailand's paid more money for imported much diesel oil and crude oil. Current world oil prices are likely move to higher from marketing trend. Renew able energy such as biodiesel could help protect the environment better than diesel fuel. Biodiesel produced from vegetable oils, animal fats and even used. This research study about biodiesel from roselle seeds for renewable fuels. Roselle can crop productivity growth all weather conditions of each region of the country sufficient to produce biodiesel.