The utility model discloses a butterfly valve valve rod hole hole milling device, including the mount, the left end portion of mount up end is provided with left side drilling mechanism, right -hand member portion is provided with right side drilling mechanism, to treat the valve body of processing places on the mechanism is holed on the right side, the circular frame at disk seat position cup joints on the limiting plate, infra -red transmitter's luminous point faces registration hole and explains that first drill bit and second drill bit are on same axis, then, angle according to infrared ray adjustment valve body, upper portion up to the valve body, be the valve rod pass the portion axle center and first drill bit and second drill bit axle center on same straight line, then, the 3rd drive motor drive second drill bit is rotatory, fourth driving motor transmission second drill bit is move along, the first drill bit of driving motor drive is rotatory, the first drill bit antedisplacement of the 2nd driving motor transmission, drill.