Grain-oriented electrical steel sheet and method for refining magnetic domain of same

A grain-oriented electrical steel sheet, comprising:

• a linear groove formed in a direction crossing a rolling direction on one surface or both surfaces of an electrical steel sheet;
• a linear thermal shock portion formed in the direction crossing the rolling direction on one surface or both surfaces of the electrical steel sheet;
• and
• the groove and the thermal shock portion are substantially parallel,
• wherein the groove and the thermal shock portion are formed in plural along the rolling direction,
• at least one distance D2 between nearest two of the groove and the thermal shock portion is 0.22 to 0.3 times a distance D1 between the grooves,
• the thermal shock portion has a difference in Vickers hardness (HV) of 10 to 120 from a surface of the steel sheet in which the thermal shock portion is not formed,
• a solidified alloy layer formed at a lower portion of the groove is included, and the solidified alloy layer has a thickness of 0.1 μm to 3 μm, and
• at least one distance D3 between nearest two of the thermal shock portions is 0.2 to 0.4 times the distance D1 between the grooves.