The invention provides a fabricated type cavity board for a stress island cavity floor
system. The fabricated type cavity board is a concrete prefabricated member and comprises longitudinal ribs, end exposing devices for transverse
short ribs for bidirectional loading, cavity hole forming components, lower
flange plates, ribs or locally-exposed stirrups of the ribs, and stress island reserved corners. The fabricated type cavity board is characterized in that the two ends of each longitudinal rib of the fabricated type cavity board are exposed; according to the end exposing devices for the transverse
short ribs, the ends of the transverse
short ribs are temporarily wrapped by vulnerable light materials, so that transverse ribs of the fabricated type cavity board are locally concave; five faces of each cavity hole forming component are located in the cavity board, and the upper surfaces of the cavity hole forming components are exposed; the lower
flange plates are compounded with the bottom surfaces of the cavity hole forming components or anti-
cracking steel meshes; and according to the stress island reserved corners, a stress island space which is larger than 0.18 mm2 is reserved when the fabricated type cavity board for contact columns is manufactured, and concrete is not poured into the reserved stress island space.