The invention provides non-oriented silicon steel, which has high magnetic permeability and low iron loss under the working flux density of 1.0-1.5 T, and a manufacturing method of the non-oriented silicon steel. According to the method, amount of foreign matters in silicon steel can be reduced and grain morphology can be improved through appropriate deoxidation control in RH refining and high-temperature short-time processing in normalizing steps, and as a result, the magnetic permeability and iron loss of the non-oriented silicon steel under the working flux density of 1.0-1.5 T are improved.