The invention discloses a construction method of a wide-span suspended steel corridor. The method comprises the following steps that 1) lifting slip devices are arranged, and molding of an upper steel structure is completed in a podium building; 2) lifters of the lifting slip devices are started to lift the upper steel structure to a first set height; 3) a first lower hanging layer steel structure is molded in the podium building and connected to the lower of the upper steel structure, and the lifters of the lifting slip devices are started to lift the upper steel structure to a second set height; 4) the step 3) is repeated till all lower hanging layer steel structures are connected; 5) the lifters of all the lifting slip devices are started to lift the whole suspended steel corridor to a designed installation height synchronously; and 6) push-pull units of the lifting slip devices are started to slide the whole suspended steel corridor to certain position. The method can be used to complete construction of the wide-span suspended steel corridor which exceeds the limit height, uses the podium building for work but insufficient in the load force, and is lifted as a whole but lacks reliable lifting points.