The invention discloses a nuclear power stator punched sheet insulation treatment method. According to the method, based on a pioneering painting technique process in which water-soluble silicon steel sheet paint is adopted to paint non-oriented silicon steel sheets for once, and innovation and improvement of production equipment, technological problems such as lower adhesion of applied paint and obvious thickening effect of the edge of a water-soluble coating of the painting technique process in which the water-soluble silicon steel sheet paint is adopted to paint the non-oriented silicon steel sheets for once can be solved, and at the same time, the technological parameters of the preparation of a stator punched sheet insulation coating are stipulated. With the stator punched sheet insulation coating produced by adopting the method of the invention, excellent adhesion, compression resistance performance, insulation performance, solvent resistance and high temperature resistant performance of the insulation coating can be ensured; and the painting technique process in which the water-soluble silicon steel sheet paint is adopted to the paint non-oriented silicon steel sheets for once is adopted at the first time internationally to perform insulation treatment on the stator punched sheets of a nuclear power half-speed turbine generator set of a million kilowatt level, so that the water-soluble insulation coating of which the thickness is smallest in the word can be produced, and the magnetic conduction effect of a stator core can be significantly improved with the safe and reliable operation of the nuclear power turbine generator ensured.