The invention relates to the technical field of shock isolation, in particular to a reinforced concrete stairs shock isolating mode and construction and replacement methods. A stairs shock isolating bracket comprises a bracket body, and a rubber protection layer wrapped at the outer periphery of the bracket body; the bracket body is formed by alternately laminating and vulcanizing rubber layers and wood/bamboo plastic fiber plates; the bracket has such advantages as excellent mechanical performance, low manufacturing cost and environmental protection, and in particular, is suitable for the shock isolation of stairs with smaller load, space and deformation; the reinforced concrete stairs shock isolating mode applying the stairs shock isolating bracket respectively put one stairs shock isolating bracket below a first pedal of each stairs section, so that an inclined support effect of stairs plates is eliminated, the condition of breaking stairs before the damage of a main structure is prevented, the shock resistance of reinforced concrete stairs is greatly improved; and the construction method of the reinforced concrete shock isolating stairs and the replacement method of the stairs shock isolating bracket are convenient and simple, and are low in construction costs.