Numerical control boring and drilling integrated tool bit device and tool changing method

The invention discloses a numerical control boring and drilling integrated tool bit device and a tool changing method, and relates to the technical field of machine tool machining. Comprising a shell installed on the boring and drilling all-in-one machine, a supporting plate is fixedly connected to the interior of the shell and divides the interior of the shell into two areas, and a drill bit tool changing mechanism used for replacing a drill bit in the boring and drilling all-in-one machine is installed in the area, located above the supporting plate, in the shell; a boring head tool changing mechanism used for replacing a boring tool bit in the boring and drilling all-in-one machine is installed at the position, located below the supporting plate, in the shell, and a boring tool rest matched with the boring head tool changing mechanism is further installed on the supporting plate. The special tool bit device can be installed on the boring and drilling all-in-one machine, rapid installation and replacement o