Connection structure of prefabricated stair of overlapped wallboard room

The utility model discloses a connection structure of a prefabricated stair of a overlapped wallboard room. The connection structure of the prefabricated stair of the overlapped wallboard room has the advantages of consuming few building materials and being short in construction time. The connection structure comprises prefabricated stair boards, a pedal bottom reinforcement, a pedal negative reinforcement, pedals, pedal distribution reinforcements and a stair board load platform; the pedal distribution reinforcements are connected between the pedal bottom reinforcement and the pedal negative reinforcement; the prefabricated stair boards are arranged between the pedal bottom reinforcement and the pedal negative reinforcement by being partitioned by the pedal distribution reinforcements, and the pedals are arranged on the upper surface of the pedal negative reinforcement and correspond to the pedal distribution reinforcements in position; the two ends of the pedal bottom reinforcement and the two ends of the p