Biomass burning device

A biomass burning device comprises a hearth and a feeding mechanism. The hearth comprises an inner barrel and an outer barrel sleeved on the outside of the inner barrel. The inner space of the inner barrel forms a burning cavity, and a feeding port for biomass fuel to enter is formed in the lateral side of the hearth. The feeding mechanism comprises a hopper, a blanking barrel jointed with the lower opening position of the hopper, a feeding barrel communicating the lower end of the blanking barrel and the feeding port, a feeding screw arranged in the feeding barrel, a feeding motor for driving the feeding screw to rotate, a first baffle penetrating the upper end of the blanking barrel movably, a first cylinder for driving the first baffle to move between the closing position in the blanking barrel and the opening position outside the blanking barrel, a second baffle penetrating the lower end of the blanking barrel movably and a second cylinder for driving the second baffle to move between the closing position