The invention relates to the technical field of metal cutting machining equipment, in particular to a device used for machining an aluminum tube groove. The device comprises a rack, a motor and a clamping mechanism are arranged on the rack, a first hydraulic rod is connected to the motor and is horizontally arranged, a saw web disc is connected to the first hydraulic rod, the clamping mechanism comprises a second hydraulic rod and a clamping jaw, the saw web disc is provided with a first annular saw web groove, a second annular saw web groove and a third annular saw web groove from inside to outside, the saw web disc is further provided with four bolts used for fixing an arc-shaped saw web, and the first annular saw web groove, the second annular saw web groove and the third annular saw web groove are provided with screw through holes. The saw web grooves with different radii are formed in the saw web disc, the arc-shaped saw web is placed into the saw web grooves with different radiiso as to cut the annular grooves with different radii, and the problems that in the prior art, drill bits in different specifications need to be replaced according to the annular cutting grooves in different sizes, time, labor and money are wasted are solved.