The invention discloses a high-efficient biomass boiler. The high-efficient biomass boiler comprises a boiler body; air inlet pipes are circumferentially arranged on the outer wall of the periphery ofa furnace pipe; first air holes which are axially arranged at intervals are formed in the pipe wall of each air inlet pipe; second air holes which communicate with the first air holes are formed in the side wall of the periphery of the furnace pipe; the second air holes are radially oblique, and the oblique directions of the second air holes are consistent; an air blower which communicates with the air inlet pipes is arranged at the material inlet end of the boiler body; a front flue and a rear flue arranged at the front and rear sides of the furnace body and are located above the furnace pipe; multiple groups of heat exchanging smoke pipes are arranged between the front and rear flues; separation plates are arranged at positions, which are between two vertically adjacent groups of heat exchanging smoke pipes, in the front and rear flues; and smoke inlets are formed in the separation plates in a staggered manner, so that smoke forms an S-shaped path after entering the rear flue, the multiple groups of heat exchanging smoke pipes and the front flue from the rear part of the furnace pipe and then is exhausted through a smoke exhausting opening.