The present invention relates to a steel pipe pillar which is filled with concrete on the inside. More specifically, the octagonal concrete-filled steel pipe pillar has four unit steel plates connected to each other on the corners of the pillar to form an octagon to be built at a low cost and enables an easy beam coupling unit design. In the octagonal concrete-filled steel pipe pillar, the steel tube is formed by coupling four unit steel plates. The unit steel plates include a flat unit and a coupling unit which is curved on both ends of the flat unit. The coupling unit is coupled to an adjacent unit steel plate to enable the octagon-shaped steel tube.
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