The invention discloses a biomass boiler anti-tempering feeding device. The biomass boiler anti-tempering feeding device comprises a machine frame, a storage cylinder is mounted at the upper end of the machine frame, a discharging pipe is mounted at the bottom end of the storage cylinder, a lifting cylinder is obliquely mounted in the machine frame, a lifting motor is mounted on the side face of the bottom end of the lifting cylinder, and a transmission shaft is mounted in the lifting cylinder; and a spiral blade is mounted on the outer side of the transmission shaft, a guiding pipe is mountedon the bottom face close to the high end of the lifting cylinder, a feeding pipe is mounted at the end of the guiding pipe, a sealing mechanism is mounted at the connection of the feeding pipe and the guiding pipe, and a feeding air pump is connected with the inlet end of the feeding pipe through an air guiding pipe. The biomass boiler anti-tempering feeding device has the beneficial effects thatthe air is injected into the feeding pipe through the feeding air pump and the air guiding pipe, disperse feeding can be conducted on the interior of a boiler, and a raw material can be circulated inthe boiler; and air injecting is conducted through the feeding air pump, the airflow in the boiler can be prevented from driving the flame to return and ignite the raw material in the device, and thesafety performance is good.