NOVELTY - The biomass fuel producing system comprises a raw material pre-heating unit and a reaction unit. The raw material pre-heating unit comprises a plasma ignition temperature control device, a circulating fluidized bed reactor, a calcium carbonate pre-heating unit, a biomass pre-heating unit, feeder A, a heat exchanger, and a plasma ignition control device. A gas compression device comprises is connected with the calcium carbonate pre-heating unit, the feeder, the plasma ignition temperature control device and the heat exchanger.    USE - The biomass fuel producing system is useful for producing calcium carbide (claimed).    ADVANTAGE - The system has reduced energy consumption, improved raw material utilization rate and production stability.    DETAILED DESCRIPTION - The biomass fuel producing system comprises a raw material pre-heating unit and a reaction unit. The raw material pre-heating unit comprises a plasma ignition temperature control device, a circulating fluidized bed reactor, a calcium carbonate pre-heating unit, a biomass pre-heating unit, feeder A, a heat exchanger, and a plasma ignition control device. A gas compression device is connected with the calcium carbonate pre-heating unit, the feeder, the plasma ignition temperature control device and the heat exchanger. The calcium carbonate pre-heater is provided with a solid material inlet, a solid material outlet, a gas inlet and a gas outlet. The feeder is connected with the calcium carbonate pre-heater through the solid material inlet. An outlet of the feeder is connected with the solid material inlet and the calcium carbonate pre-heater. The gas compression device is connected with a first gas inlet and the calcium carbonate pre-heater connected with the biomass fuel pre-heater connected with the solid material inlet, the gas outlet and the solid material outlet. The feeder is connected with a solid material mixer provided with a solid material inlet and a solid material outlet. The solid material outlet is connected with the calcium carbonate pre-heater. The inlet of the feeder is connected with the solid material outlet. The reaction unit comprises a feeder, a reactor, a heat exchanger and a gas compression device, and is provided with a solid material inlet, a gas inlet, a gas outlet and a solid material outlet. The gas compression device is connected to the reactor through a gas inlet. The reactor is a circulating fluidized-bed reactor. The circulating fluidized bed reactor and the pre-heater are connected to the plasma ignition temperature control device when the temperature of the circulating fluidized bed reactor is reduced. The gas compressing device is provided with an oxygen-containing gas inlet and another reaction unit. The feeder is a spiral pusher, start-shaped feeder, an electromagnetic vibration feeder and a built-in biomass spiral feeder, and is provided with a pneumatic valve. The heat exchanger is a tube type heat exchanger, a plate type tube type heat exchanger or heat exchange boiler.