The utility model discloses a coal fired boiler changes device that burns living beings pellet fuel, it comprises living beings granule high -order storehouse (1), frequency modulation vibrating feeder (2), frequency modulation air -blower (3), electric cabinet (4), feed blower pipe (5), the feed blower pipe takes the tubular metal resonator of quadrangle funnel or refractory material to make, and the quadrangle funnel and the frequency modulation vibrating feeder of feed blower pipe are connected, and the frequency modulation air -blower is connected to one end, and the boiler furnace gate is connected to one end, and the living beings granule receives impact and the burning of rolling of jumping of two orientation air currents in high -temperature flaming in the batcher blower pipe directly blows boiler furnace (6), like the boiling, red charcoal that burning back granule is the red heat form forms fire in a stove before fuel is added layer on constantly dropping on the grate, until turning to dust and ashes. Thereby it improves the furnace temperature and brings up to 700 DEG C by 600 DEG C, and steam pressure brings up to 1pma by 0.8pma. Have easy operation, convenience, energy -conserving effect.