The drilling and milling
machining center comprises a
machining center body, a
machining table is installed in the middle of the top end of the machining center body, a top plate is installed at the top end of the machining center body, and a hydraulic telescopic rod is installed in the middle of the top plate. A
drill bit mounting mechanism is mounted at the bottom end of the hydraulic telescopic rod, and a
drill bit bearing mechanism is mounted on the side face of the
drill bit mounting mechanism. A
drill bit is mounted by arranging a mounting plate, a motor and a mounting seat at the bottom end of a hydraulic telescopic rod, the
drill bit and the mounting seat are detachably positioned and mounted through a clamping plate and a positioning rod, and through suction connection between a first magnetic suction block and a second magnetic suction block, the positioning rod is stably connected in an inserted mode and is not prone to falling off, and the positioning rod is conveniently pulled out; the
drill bit is convenient to disassemble and replace; and the protective cylinder protects the motor and the outer side of the mounting plate, so that flying scratches caused by machining scraps are reduced, and the safety of the motor is protected.