The invention relates to the field of fabricated prefabricated stair construction, and particularly discloses a rotating type energy-dissipation-seismic-mitigation stair node connecting device. The device comprises a prefabricated stair end and a prefabricated platform beam, wherein a damping anti-seismic layer is arranged between contact surfaces of the prefabricated stair end and the prefabricated platform beam, and edges, located at the upper ends and the lower ends of the contact surfaces, of the prefabricated stair end and the prefabricated platform beam are connected through a top rotating steel plate and a bottom rotating steel plate correspondingly. According to the connecting device, certain rotation can be provided, vertical constraint and horizontal constraint can also be provided, when a stair is vibrated, the damping anti-seismic layer provides certain deformation, the rotating steel plates can provide a certain rotation amount, the damping anti-seismic layer cooperates with the rotating steel plates, and the anti-seismic performance of the stair is effectively improved.