Anti-seismic stair

The utility model relates to an anti-seismic stair which comprises prefabricated stair plates, stair beams, structural columns and frame beams. The prefabricated stair plates comprise stair flight plates, rest platform plates, upper-layer fixed support assemblies and upper-layer movable support assemblies; through circular holes are formed in the upper-layer fixed support assemblies, and stainless steel plates which are embedded in the bottoms of the circular holes are arranged on the upper-layer fixed support assemblies; through elongated holes are formed in the upper-layer movable support assemblies, and stainless steel plates which are embedded in the bottoms of the elongated holes are arranged on the upper-layer movable support assemblies; the stair beams are arranged at the bottoms of the rest platform plates and are respectively shelved on the frame beams and the structural columns; embedded stainless steel plates and shear keys are arranged on the tops of the stair beams, and the shear keys are embedded in the middles of the embedded stainless steel plates; the shear keys respectively penetrate the circular holes and the elongated holes; spaces among the circular holes, the elongated holes and the shear keys are respectively filled with elastic rubber material layers. The anti-seismic stair has the advantages that the anti-seismic stair is simple in structure, convenient to mount and low in negative influence on building structures, and can freely move under the effects of horizontal seism, and the like.