In order to solve the difficulties in continuous feeding and stable combustion, and high pollution emission level during the combustion of maize straw and wood chips, a biomass crushed aggregates burner with horizontal feeding mode, anti-tempering and cold air pressure protection of furnace wall were designed. The combustion experiments were carried out at different ratios of primary to secondary air. The main conclusions were as follows: the temperature variation range inside the furnace was varied as (1200±100)℃ when the proportion of primary to secondary air (PPSA) was 0.8∶0.2 and the wood chips was used as fuel in the stable combustion stage. The temperature of the flue gas at the outlet was varied at (1000±100)℃. Under the conditions of PPSA was 0.8∶0.2 or 0.7∶0.3, the O2, CO2 and CO mass fraction in the flue gas was fluctuated at (13±2)%, (7±2)% and (0.2±0.1)%, respectively. The combustion efficiency were 98.8% and 98.5%, respectively. When maize straw was fuel, under the same PPSA, compared with burning wood chips, the temperature in the furnace and the temperature of the flue gas was lower by about 100℃. No matter the PPSA was 0.8∶0.2 or 0.7∶0.3, the average O2 content in combustion flue gas was slightly lower, about 1%. The CO content was slightly higher, but the CO2 content was not remarkably different. The combustion efficiency was 98.7% and 98.9%, respectively. Compared with the PPSA was 0.8∶0.2, when the PPSA was 0.7∶0.3, whether the wood chips or maize straw were fuel, the temperature inside the furnace and the temperature at the outlet were lower than the former by about 100℃. The blackness of exhaustion (Ringelman emittance, level) was less than or equal to 1 when the PPSA was 0.8∶0.2 and 0.7∶0.3. When the PPSA was 0.8∶0.2, the PM2.5, PM5 and PM10 in the flue gas was respectively in the range of 56~72mg/m3, 38~51mg/m3 and 43~63mg/m3 with wood chips as the fuel. When corn stalk was fuel, it was respectively in the range of 36~43mg/m3, 21~35mg/m3 and 38~42mg/m3, which met the emission standards of atmospheric pollutants in boilers.