Biomass energy is the energy form of solar energy stored in biomass in the form of chemical energy, that is, energy with biomass as a carrier. It is the fourth largest energy source in the world, second only to coal, oil and natural gas. Biomass energy is a clean renewable energy and the only renewable energy. It has the characteristics of renewable, low pollution, wide distribution, and abundant total amount. It is an ideal alternative energy source for fossil fuels.