Stable positioning and fixing device for round pipe machining

The utility model discloses a stable positioning and fixing device for round pipe machining, and relates to the technical field of round pipe machining devices. Comprising a groove base used for installing a moving mechanism and a connecting rod, the moving mechanism is rotationally connected to the interior of the groove base and slidably connected with the inner side face of the groove base, the connecting rod is fixedly connected with the moving mechanism and one end of the groove base, and a rotating mechanism is fixedly connected to one end of the connecting rod. The clamping mechanism is slidably connected into the rotating mechanism. Compared with the prior art, the stable positioning and fixing device for circular pipe machining has the advantages that through cooperation of the moving mechanism, the rotating mechanism and the clamping mechanism, not only can circular pipes of various thicknesses be fixed, but also circular pipes of various lengths can be stably fixed, the situation that only one size