The invention discloses an assessment method of environmental feasibility of biomass cooling and heating power system. The assessment method specifically comprises following steps of (1) building a biomass cooling and heating power supply system model and a traditional independent power generation system model respectively by regarding a thermodynamic model as a basis; (2) building a biomass cooling and heating power system operation schematic diagram and determining equipment parameters of a prime motor and a refrigerating machine; (3) estimating systems of six different configuration structures by utilizing a life cycle analysis method, determining influence of a cooling and heating load ratio on the environmental feasibility and a primary energy saving rate based on the three estimationdata result; comparing with an independent traditional system and analyzing a relative influence from variation of the cooling and heating ratio to the environment. The assessment method not only regards a primary energy saving rate (PESR) as an assessment index, but also regards difference of influences of a CCHP system and the traditional system on the environment (that is the environmental feasibility) as an assessment index and gives consideration to the influence of the load variation on the environmental feasibility of the CCHP system.