The invention discloses a non-oriented silicon steel coating and its application. Based on the total mass of the coating, its components and corresponding mass percentages are: organic silicon resin, 10%-25%; aluminum dihydrogen phosphate, 10% ~30%; zinc dihydrogen phosphate, 6%~20%; colloidal silica, 4%~26%; propylene glycol, 1%~3%; the balance is water. The non-oriented silicon steel coating of the present invention not only completely eliminates the environmental protection problems caused by the chromium element, but also has the characteristics of good surface condition, high adhesion, high insulation, high corrosion resistance, high temperature resistance and high weldability, and can be widely used It is suitable for preparing non-oriented silicon steel coating, especially suitable for surface coating treatment of cold-rolled non-oriented electrical steel sheet.