The invention relates to an edger for removing cross-hole burr and a method of using the same; in particular comprising: an edge body composed of a cylindrical clamping shank installed on a rotation driving device and a pair of elastically moving elastic arms formed by extending at outside of the clamping shank; a tool tip formed at the outside face adjacent to each elastic arm end, one end having a first blade removing part of the burrs in positive rotation, the other side having a second blade removing the rest burrs in reverse rotation. The invention in said structure can efficiently remove the burrs caused when the cross-holes remove the boreholes at inclined plane.