The invention relates to an interlocking device of a scaffold steel frame plate, which comprises a steel frame plate, wherein the steel frame plate comprises a framework and a pulling net; the interlocking device of the scaffold steel frame plate is characterized in that an extended part is arranged on a crossbeam at one end on the length direction of the steel frame plate and used for overlapping a putlock, and simultaneously an interlocking hook is arranged on the crossbeam; a rectangular buckle plate is extended on the crossbeam at the other end, and a detachable lockset for locking the steel frame plate to be connected with the putlock is arranged between the buckle plate and the crossbeam at the end; and the buckle plate is buckled with the interlocking hook on the other steel frame plate to realize the mutual interlocking on the length direction of the steel frame plate.