The invention discloses a biomass power generation device and method. The device comprises a pulverizer and a stirling generator. A feeding opening is formed in the top end in the pulverizer, a pulverizing blade is arranged on the outer side of a pulverizing roller, the left side of a forming machine is connected with the top end of a raw material pushing machine, the upper portion of the left side of a combustor is arranged on the top end of a conveying belt, and the stirling generator is located on the outer side of the combustor. According to the biomass power generation device and method,raw material pushing is facilitated, conveying work and drying work are synchronously carried out, pressure of raw material extrusion forming can be conveniently ensured, stability after raw materialextrusion forming is ensured, the raw material is not prone to scattering, sufficient combustion of the raw material can be ensured, sufficient using of the raw material is ensured, power generation quality is ensured, production efficiency is improved, waste water, waste gas and waste slag can be treated, pollution emissijon can be reduced, and clean production is facilitated.