The invention relates to a small heating power generation burning device applied in families and units, in particular to an environment-friendly biomass granular fuel heating power generation furnace which comprises a burning system, an air circulating system and a water circulating system. The burning system comprises a fuel feeding box, an upper water tank and a burning chamber, a netty stainless steel barrel capable of moving up and down and with the bottom end closed is mounted at the bottom of the fuel feeding box, the burning chamber is positioned above the upper water tank, and a thin square pipe is arranged at the bottom of the upper water tank; the water circulating system comprises a mixing chamber, a lower water tank, a heat radiator and a backflow pipe, the air circulating system comprises an impeller and an air suction pump connected with the top end of the lower water tank through a pipeline, the mixing chamber is arranged below the impeller, the front of the impeller directly faces an air outlet of the thin square pipe, the lower water tank is positioned below the burning chamber, and the bottom of the lower water tank is connected with the heat radiator through a water circulating pump. The problem that a biomass granular fuel burning device in the prior art is prone to smoking and coking during burning is solved, and carbon dioxide generated during burning is treated through the water circulating system inside, so that low-carbon and zero-carbon emission is realized. The environment-friendly biomass granular fuel heating power generation furnace is safe, environment-friendly and suitable for small indoor burning heating power generation systems.