The invention belongs to the field of biomass combustion and particularly relates to a biomass combustion furnace capable of realizing sufficient combustion of biomass fuel and exhaust purification. The biomass combustion furnace comprises a feeding hole, a feeding device, a combustion device, a stove opening and a dust removal device; the feeding device is located below the feeding hole and is connected with the combustion device; and the combustion device is connected with the stove opening and the dust removal device. The combustion device can realize suspension combustion of a fuel and ensures that the fuel is combusted more sufficiently; and the dust removal device realizes multistage dust removal and can be used for conveniently clearing ash.