Fastener hole centering drilling device for seat guide rail in lower pound column area of passenger-to-cargo airplane

A fastener hole centering drilling device for a seat guide rail in a lower pound column area of a passenger-to-cargo airplane comprises a support, a center positioning device, a reversing support and N drilling positioning devices. When the fastener hole centering drilling device is used, a seat guide rail profile is placed in the support, then the center positioning device is inserted in a round clamping hole, afterwards, the drilling positioning devices are inserted into another round clamping hole needing to be drilled, drill bits move downwards along guide holes, and a hole can be drilled in a drilling surface. Since the diameters of the guide holes in different drilling positioning devices can be different, the drilled hole can be broadened step by step from a small hole to a large hole by constantly changing the drilling positioning devices, and the retrofitting standards of Boeing aircrafts are met. Since the guide holes are perpendicular to the drilling surface all the time, the drilling perpendicular