The Agriculture is the main source of livelihood for about 60 per cent of India's population. India generates huge amount of agricultural wastes or crop residues. Proper utilization of these wastes is very important. Burning of crop residues in the field causes excessive particulate matter emissions and air pollution. Agricultural waste burning has become major environmental problem causing health issues and also leads to global warming. We can extract energy present in waste by making compost, briquettes or biogas. This review comprehensively summarizes the various parameters in pre-treatment of agricultural wastes such as Accessible surface area, Crystallinity and Cross linkages of Hemicellulose and Lignin for conversion to biogas. In addition, various strategies to improve the yield of biogas like physical, chemical and biological pre-treatments are also reviewed. [ABSTRACT FROM AUTHOR]