The invention relates to a trim strip for wire arrangement at a top corner. The trim strip for wire arrangement at the top corner comprises at least two buckles and a trim strip body clamped with the buckles. The trim strip for wire arrangement at the top corner is characterized in that each buckle comprises a transverse part which can abut against a top plate, a vertical part which can abut against a wall plate, and an arc-shaped part which makes the transverse part and the vertical part connected and can limit an electric wire; screw holes are formed in the center of each transverse part and the center of each vertical part, and hollow spherical chucks are arranged at the free end of each transverse part and the free end of each vertical part; and the trim strip body comprises can an upper corner which can abut against the top plate, a lower corner which can abut against the wall plate, and step grooves allowing the hollow spherical chucks to be inserted and locked therein. Compared with the prior art, the trim strip for wire arrangement at the top corner is simple and attractive in structure, low in manufacturing cost and easy and convenient to construct.