Prefabricated stair

The utility model relates to the technical field of assembly type building construction, and discloses a prefabricated stair which comprises a stair prefabricated part, the stair prefabricated part comprises a bottom end connecting section, a top end connecting section and a stepping section, and each step of the stepping section comprises a horizontally-arranged tread and a vertically-arranged kicking surface; the end, close to the ground, of the stepping section is connected to the bottom end connecting section, the end, away from the ground, of the stepping section is connected to the top end connecting section, a plurality of connecting sleeves are arranged on the side, used for installing the handrail, of the stepping section and are perpendicular to the tread, and the top ends of the connecting sleeves are flush with the tread. Protective vertical rods are inserted into the connecting sleeves; the method has the effect of simplifying the mounting and dismounting procedures of the prefabricated stair edg