The invention provides a biomass gasification Stirling power generation system, and belongs to the technical field of Stirling power generation. The biomass gasification Stirling power generation system is characterized in that a biomass gasification system, a Stirling power generation system and waste heat are combined, fuel gas generated by the biomass gasification system is conveyed to the Stirling power generation system through a pressurizing device, the fuel gas and combustion-supporting air are mixed according to a ratio of 1:3 in a combustor, the fuel gas is ignited through the spark plug of the combustor, a Stirling power generator is heated to generate power, high-temperature residual smoke generated by power generation can heat the combustion-supporting air through a heat exchange device and finally enters a waste heat utilization system for heat supply and refrigeration, and generated smoke tail gas is subjected to desulfurization, denitrification and dust removal treatmentthrough a tail gas treatment device and then is discharged after reaching the standard.