Mahua oil derived from the seeds of the Madhuca indica tree, is an excellent candidate for biodiesel production due to its favourable fatty acid composition and high oil content. In-situ biodiesel synthesis simplifies the process by combining the transesterification reaction within the same reactor, reducing the need for a separate esterification step. Biodiesel has drawn a lot of interest recently as a sustainable and eco-friendly replacement for traditional fossil fuels. In this regard, the manufacturing of biodiesel from inedible feedstocks, such as mahua oil seeds, offers a possible path towards the creation of sustainable energy. The full method of producing in-situ biodiesel from mahua oil seeds is covered in detail in this abstract, along with its significance in the context of renewable energy sources, important phases, and difficulties that must be overcome. Oil extraction, pretreatment, transesterification, separation, washing and purification, drying, and quality control are the main phases in the in-situ biodiesel synthesis process from mahua oil seeds. Mahua oil is extracted, given a first cleaning step to get rid of contaminants, and then put through a transesterification procedure that turns it into biodiesel and glycerol in a single reactor. Separating the leftover glycerol and washing and purifying the crude biodiesel to ensure it satisfies quality standards. Mahua oil-based in-situ biodiesel synthesis has renewable energy options and contributes to a more sustainable and environmentally friendly energy.