The invention relates to a biomass particle boiler with compact arrangement, small capacity and large output. The biomass particle boiler comprises an intelligent control system, a combustion chamber, a combustor, a smoke outlet, a primary fan, a secondary fan, an induced air fan, a deaerator, a heat exchange chamber, a bag type dust remover, a steam and water separator, a steam separating cylinder and a boiler water purifier, wherein the heat exchange chamber adopts a convection pipe bundle to exchange heat; the heat exchange chamber is separated into four areas from top to bottom, and spraying and blowing devices are arranged at the four areas. The biomass particle boiler has the advantages that by adopting the multi-surface surrounding type deaerator, under the condition of guaranteeing the combustion temperature in the boiler, the heat insulation thickness is reduced, and supplied water can be preheated; the combustion chamber is separated from the heat exchange chamber; the combustion chamber is arranged in a folding way, and a secondary air increasing type is adopted, so the complete combustion is guaranteed; the heat exchange chamber is separated into the multiple areas, so the heat exchange is complete on the basis of guaranteeing a clean pipeline, and the temperature of tail exhaust smoke is low; by adopting the bag type dust removal, the smoke flowing to the atmosphere is very clean; by adopting the compact type arrangement, the size of the whole boiler is minimum.