The invention discloses a sectional-type steel tube frame structure. The sectional-type steel tube frame structure comprises steel tube columns, fixed steel beams, a floor steel beam and bracket steelbeams. The steel tube columns are vertically arranged on a tower footing, the fixed steel beams are arranged between the steel tube columns, the floor steel beam is arranged on the outer sides of thesteel tube columns, and the bracket steel beams are arranged on the outer side of the floor steel beam. The fixed steel beams, the floor steel beam and the bracket steel beams are arranged horizontally; the floor steel beam is divided into a bright layer steel beam body and a dark layer steel beam body, wherein the bright layer steel beam body and the dark layer steel beam body are arranged in aspaced mode. The invention further discloses an installation method of the sectional-type steel tube frame structure. By the adoption of the sectional-type construction method, a tower body is dividedinto multiple segments to be constructed, in this way, the weight of each steel bar is lowered, and construction difficulty is lowered; meanwhile, based on the sectional-type building mode and own tenacity of the steel bars, good tenacity can be provided for the ancient tower, then excellent anti-wind capacity is achieved, and safety performance is improved.