Pre-coating agent composition for grain-oriented electrical steel sheet, grain-oriented electrical steel sheet comprising same, and manufacturing method therefor

A grain-oriented electrical steel sheet comprising:

• a pre-coating layer formed on a surface of the grain-oriented electrical steel sheet;
• and
• a tension coating layer formed on a surface of the pre-coating layer,
• wherein the grain-oriented electrical steel sheet is a grain-oriented electrical steel sheet from which a forsterite (Mg2SiO4) film is removed,
• the pre-coating layer includes an acid containing boron (B)), metal dihydrogen phosphates, and silica, and
• adhesion between the grain-oriented electrical steel sheet and the tension coating layer is controlled by the pre-coating layer,
• wherein the acid containing boron (B) is at least one selected from the group consisting of borinic acid, boronic acid, boric acid and a combination thereof, and
• the pre-coating layer comprises 20 to 40 parts by weight of the silica and 5 to 15 parts by weight of the acid containing boron (B), based on 100 parts by weight of the metal dihydrogen phosphates.