The utility model discloses an adjustable double-side restraining cutter bar, wherein a screw hole vertically penetrates through the cutter bar; more than two propelling rod through holes are arranged towards inward at the top on the periphery of a flange part in a surrounding way at equal intervals; top column through holes corresponding to the propelling rod through holes are arranged towards downward on the top surface of the flange part; propelling rods are arranged in the propelling rod through holes in a penetrating way; the slope at the top of the propelling rods pushes against top columns in the top column through holes; and screws which are used for pushing the propelling rods to move outwards at the same time by the slope are screwed in the screw hole. When the adjustable double-side restraining cutter bar is mounted on a main shaft of a tool machine through a cone-shaped rod, the screws can be rotated to drive the propelling rods to adjust the height of the top columns; and the top surfaces of the top columns are tightly attached to the bottom surface of the main shaft of the tool machine, so that the adjustable double-side restraining cutter bar is suitable for being installed in gaps with different sizes, is very convenient to use, and does not need an additional gasket.