The utility model discloses an efficient biomass tar-free gas making furnace. The gasification furnace comprises a gasification furnace body, a first catalytic furnace is mounted in the gasification furnace body; a gas outlet pipe is communicated above the first catalytic furnace; a filter plate is arranged at the bottom of the first catalytic furnace; the upper end of the air outlet pipe is communicated with the condenser pipe through a horizontally arranged connecting pipe; the condenser pipe is sleeved with a coaxial sleeve; one side of the sleeve is communicated with a cold air generator;an exhaust pipe which is communicated with the condensation pipe and upwards penetrates through the sleeve is arranged at the top of the condensation pipe; a second catalytic furnace is arranged belowthe sleeve; a liquid discharge pipe communicated with the condensation pipe and the second catalytic furnace is arranged between the condensation pipe and the second catalytic furnace, a gas guide pipe is communicated between the top of the second catalytic furnace and the connecting pipe, valves are arranged on the liquid discharge pipe and the gas guide pipe, tar cracking catalysts are filled in the first catalytic furnace and the second catalytic furnace, and a heating device is mounted on the second catalytic furnace. According to the utility model, fuel gas is purified, and tar is utilized.