The invention relates to a drilling hole indexing fixture and belongs to the technical field of fixtures. The drilling hole indexing fixture comprises a chunk, chunk claws are evenly arranged on the upper portion of the chunk, a packing is arranged on the lower portion of the chunk, a bearing sleeve and a bottom board are sequentially connected onto the lower portion of the packing, an inner sleeve is sleeved on the inner portion of the packing, a first bearing and a second bearing are installed between the bearing sleeve and the inner sleeve, a ratchet wheel is arranged between the first bearing and the second bearing, a pawl is arranged on one side of the ratchet wheel, a positioning shaft is arranged on the pawl, a first spring is arranged on one side of the pawl, the other side of the first spring is connected with a jack screw, a pressing block is connected onto the bottom board through bolts, and a second spring is installed at the lower end of the pressing block. The drilling hole indexing fixture is a drilling and tapering fixture having the functions of accurate indexing and clamping, is easy and convenient to operate and easy to master, can be widely applied to small enterprises or individual business specializing in producing flange plate drilling or tapering products and is low in cost and high in product accuracy.