The present invention relates to an apparatus for removing tar of a biomass gasification system, comprising: a heat exchange housing 310 having a lower portion in communication with a gas generating unit 200, and forming a plurality of ducts in the heat exchange housing 310 to prevent air and A multi-conduit assembly 320 for exchanging gas but communicating the upper and lower sides to a conduit, a steam generating unit 330 for exchanging heat with the generated gas under the multi-conduit assembly 320, and the steam generating unit 330 The tar removal and guide portion 340 for removing the tar and inserting the guide screw 342 into the pipeline, and an up-and-down operation portion for double-moving the tar removal and guide screw 342 of the guide portion 340 and up and down ( 350), but the tar removal and guide unit 340 is a support assembly ( 341) to remove a plurality of tar and combine the guide screw 342, and the upper and lower operation unit 350 forms a rotating disk 351 before and after, but an operation bar on one side of the rotating disk 351 before and after ( 355 is connected, and a plurality of operating arms 352 are protruded outwardly at a right angle to the operating bar 355 to remove tar and get caught in the support assembly 341 formed on the top of the guide screw 342 to a certain height. Since it is configured so that it can be raised, it is possible to stably perform biomass gasification, and at the same time, it removes tar and efficiently removes the generated tar by double acting of the guide screw, thus improving productivity and efficiently removing tar. Since the cyclone is unnecessary and the cost of manufacturing and maintenance can be reduced due to this, the competitiveness is greatly improved.