The invention discloses a method for upright hoisting of rebars in narrow space based on an integral platform. The method comprises the steps of arranging a first station on the integral platform, and splicing rebars to form a rebar set; arranging a second station on the integral platform, and hoisting the rebar set to the second station from the first station for upright descending of the rebar set, wherein the second station is located above the work face of the rebars; arranging a third station on a lower hanging frame body of the integral platform, and guiding upright descending of the rebar set; arranging a fourth station on the lower hanging frame body of the integral platform, releasing binding of the rebar set descending to the work face of the rebars, and conducting rebar installation, wherein the fourth station is located on the work face of the rebars. By reasonably planning multi-person work steps and personnel and mechanical station arrangement during upright hoisting of the rebars, the rebars can be transferred onto the work face of the rebars from the top of the platform quickly and safely in bulk, potential safety hazards of traditional methods adopting ordinary rope hanging tools and one-by-one step-by-step manual transfer are eliminated, and rebar transfer efficiency is improved.