A single track fork utensils monitored control system that can the centre from the soundness of the single track fork ware of long -range grasp, the reliability is high is provided. Have: a pluralityof removal roof beams of series connection, a plurality of platform trucks, the roof beam is respectively removed in the supporting, conversion equipment more than two makes the position of respectively removing roof beam removal to first advance route or second advance route, a plurality of fixing device remove the roof beam and fix the position in first advance route or second advance route each, a plurality of first displacements are counted, detect the position of each platform truck when each removal roof beam is in the position of first advance route, a plurality of second displacementsare counted, detect the position of each platform truck when each removal roof beam is in the position of second advance route, and the monitor, the position of keeping watch on each platform truck, the output that the monitor was counted according to each first displacement judges that whether each platform truck is in the corresponding preset first closed position in position of first advance route, judges according to the output of each second displacement meter whether each platform truck is in the corresponding preset second closed position in position of second advance route.