The invention relates to the field of plugging equipment, particularly to a pipeline hole plugging apparatus. The pipeline hole plugging apparatus comprises an annular plugging body and an annular expansion auxiliary body, wherein the section of the plugging body is U-shaped; annular screw threads are arranged on the two side walls in the U-shaped structure of the plugging body; the section of the expansion auxiliary body is trapezoidal; screw threads, which are matched with the screw threads in the U-shaped structure of the plugging body, are arranged on two tilted side faces of the trapezoidal structure of the expansion auxiliary body; and the width of the upper end plane of the expansion auxiliary body is less than or equal to that of the interior of the U-shaped structure of the plugging body while the width of the lower end plane of the expansion auxiliary body is greater than that of the interior of the U-shaped structure of the plugging body. The pipeline hole plugging apparatus obtained in the invention is simple in structure, convenient to use, capable of plugging pipeline holes and the pipeline holes equipped with cables and excellent in effect.