Eight-hole numerical control gun drill and using method thereof

The invention provides an eight-hole numerical control gun drill and a using method thereof, and relates to the field of numerical control machine tools. The eight-hole numerical control gun drill comprises a device bottom plate, a supporting straight barrel is fixedly connected to the middle of the upper side of the device bottom plate, and the upper side of the supporting straight barrel is fixedly connected to the outer end of the lower side of an electromagnetic hydraulic cylinder; the lower side of the electromagnetic hydraulic cylinder is connected with a sliding sleeve shell sequentially through a downward pressing supporting rod, a supporting sliding plate, an upper shaft limiting plate, an upper rotating shaft, a transmission shaft and a lower rotating shaft, and the sliding sleeve shell is connected with a gun drill shell through a drilling sliding block and a drilling sliding groove. The interior of the gun drill shell is sequentially connected with a connecting rotating shaft, a rotating drilling