Drilling machine for flange machining

The utility model discloses a drilling machine for flange machining, which relates to the technical field of drilling machines and comprises a bottom plate, a drilling unit and a fixing unit. Arched plates are mounted at the upper ends of the bottom plates; the drilling unit comprises a guide vertical column, an up-down pull rod, an inflection plate, a drilling column, a drilling motor, a transmission chain and a drill bit, the guide vertical column is slidably connected to the right side of the upper end of the arched plate, the up-down pull rod is slidably connected to the upper end of the arched plate and located on the right side of the guide vertical column, and the lower ends of the guide vertical column and the up-down pull rod are connected to the upper end of the inflection plate; the drilling column is rotationally connected to the right end of the interior of the inflection plate, a drilling driven gear is installed in the middle of the drilling column, and the drilling motor is installed at the up