The invention discloses a grinding tool fixing device with a shock absorption function. The grinding tool fixing device with the shock absorption function includes a connecting plate, wherein first supporting rods are connected with the right side of the end portion of the connecting plate in an attached mode, and second supporting rods are rotatably connected with the right side of the first supporting rods through damping rotating shafts. One ends of the second supporting rods are movably connected with hydraulic shock absorbers, and one ends of the hydraulic shock absorbers are connected with a hollow seat in an attached mode. The right side of the connecting plate is welded to a fixing rod positioned between the two first supporting rods, and a sliding plate is fixedly connected with the right side of the fixing rod. A seat stand is connected with the inner wall of the hollow seat in an attached mode, a gap at the end portion of the seat stand is matched with a first spring whose right end is welded to the inner wall of the hollow seat, and the left side of the first spring is fixedly connected with a column pin. When the grinding tool is rotated to cut, and is contacted with objects need to be grinded, a certain displacement can be used to buffer the impact force of the grinding tool, the damage of the grinding tool can be reduced, and the service life can be prolonged.