The invention discloses an overlap joint type structured airflow guide floor board, which comprises a first transverse beam, a second transverse beam, a first longitudinal beam, a second longitudinal beam, a third longitudinal beam, a fourth longitudinal beam, a panel, a first grating and a second grating, wherein the first transverse beam and the second transverse beam are parallel to each other; the first longitudinal beam, the second longitudinal beam, the third longitudinal beam and the fourth longitudinal beam are parallel to each other; the first transverse beam, the second transverse beam, the first longitudinal beam, the second longitudinal beam, the third longitudinal beam and the fourth longitudinal beam are vertically staggered; the panel is above the fourth longitudinal beam; and the first grating and the second grating are among the first transverse beam, the second transverse beam, the first longitudinal beam, the second longitudinal beam, the third longitudinal beam and the fourth longitudinal beam. According to the invention, by adopting the overlap joint type structure, the current problem that the opening rate and bearing contradict with each other is solved; and bearing also satisfies requirement of machine rooms in the event of increasing the opening rate.