The invention discloses a steel pipe column for a subway station and a construction process of the steel pipe column. The steel pipe column comprises a steel pipe supporting column, a middle joint structure arranged on the middle portion of the steel pipe supporting column and a lower joint structure arranged on the lower portion of the steel pipe supporting column. The middle joint structure comprises a round tray coaxially arranged on the steel pipe supporting column in a sleeving manner; a middle plate beam is supported on the round tray which is located below the middle plate beam; and the round tray is installed on the steel pipe supporting column in a clamped manner, and the steel pipe supporting column penetrates the interior of the middle plate beam. The lower joint structure comprises an upper stiffening structure, a middle stiffening structure and a lower stiffening structure which are arranged from top to bottom; and the upper stiffening structure, the middle stiffening structure and the lower stiffening structure are all poured in a bottom plate. The construction process includes the first step of pile hole excavation, the second step of steel pipe column hoisting and the third step of concrete pouring. The steel pipe column for the subway station is reasonable in design, easy and convenient to construct and good in using effect, the construction process of the steel pipe column in the subway station can be easily, conveniently and fast completed, and the constructed and formed steel pipe column is excellent in mechanical property.