An improved upright drilling jig comprises two parallel panels parallelly
mounted on a leveled base platform, and an inclined-hole drilling jig
slidably disposed between the sides of the parallel panels in a manner
that it can be vertically adjusted. A sliding saddle is slidably mounted
at the top of the inclined-hole drilling jig through two axial bars. The
rear side of the drilling jig is concavely constricted to form a bow
jumper area and disposed with a discharge concavity in a manner
approaching a clamping end plane. The discharge concavity has a chip hole
inside that communicates with a guide axle hole. Such arrangement can
achieve optimum performance of inclined hole drilling of woodwork.