Biomass energy, as a low-carbon energy source with high calorific value, is more suitable for the transition to clean heating in northern regions. With the ecological development of cities, the area of urban green spaces has increased, and the total amount of dead branches, fallen leaves, or maintenance and pruning materials of green plants is relatively large. However, the lack of renewable application solutions has resulted in a large amount of waste. However, the practical application of biomass energy still faces problems such as dispersed raw material resources, low technological level, and imperfect management and incentive mechanisms. This article takes Xi'an as an example and evaluates the current situation of green biomass energy in Xi'an, which shows that it has great heating potential. On this basis, a “collection addition storage operation combustion” full chain clean heating technology path with distributed collection and storage as the core was proposed, aiming to improve the efficiency of biomass energy utilization, promote clean energy heating, promote the circular utilization of urban green biomass, and reduce carbon emissions.