Fixing device for aluminum alloy pipe machining

The utility model belongs to the technical field of aluminum alloy, and particularly relates to a fixing device for aluminum alloy pipe machining, which comprises a workbench, a placing groove is arranged on the upper surface of the workbench, a second motor is arranged in the placing groove, the output end of the second motor is connected with a rotating shaft, a placing mechanism is arranged on the surface of the rotating shaft, and the placing mechanism is connected with the rotating shaft. A working frame is arranged on the side surface of the workbench, and a lifting mechanism is arranged on the upper surface of the working frame. After the aluminum alloy pipe is clamped, a hydraulic pump can be used for driving a hydraulic rod and driving a clamping block to descend to one side of a fixing cylinder, and then a pneumatic pump is used for driving a pneumatic rod and driving the fixing cylinder, so that the two ends of the aluminum alloy pipe are inserted into the fixing cylinder; and then a fixing plate i