The present invention is designed to block the pipes used to cut off certain parts of the pipe for maintenance work such as high pressure gas, oil, hot water, etc., such as valve replacement, pipe relocation, new pipe installation, and old pipe replacement. The plugging machine relates to a plugging head and a lever body for blocking pipes to a piston rod of a plugging machine, and to prevent the piston rod from bending in an axially perpendicular direction due to the weight of these heavy parts in the process of connecting the guide. The present invention relates to a piston rod deflection prevention device of a plugging machine for blocking pipes, which facilitates the operation of the machine. The present invention is installed in the housing 12 of the plugging machine 10 and the guide plate 30, the through-hole 31 is formed in the center of the piston rod 11 is fitted, which is installed on the edge of the guide plate 30 A plurality of rollers 32, which are in contact with the inner surface of the housing 12 and are adapted to perform rolling motion, and a lower portion of the inner surface of the housing 12 of the plugging machine 10 to limit downward movement of the guide plate 30. The stopper 40 is provided.
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