Cold-rolled non-oriented silicon steel low in iron loss and production method

The invention discloses cold-rolled non-oriented silicon steel low in iron loss. The cold-rolled non-oriented silicon steel low in iron loss is composed of, by weight, Si of 3.0-3.7%, Als smaller than or equal to 0.15%, C smaller than or equal to 0.004%, Mn of 0.15-0.80%, P smaller than or equal to 0.02%, S smaller than or equal to 0.005% and N smaller than or equal to 0.002%. The invention further discloses a production method of the cold-rolled non-oriented silicon steel low in iron loss. The production method comprises the production steps of steel making and blank casting; cast blank heating; hot rolling; normalizing; cold rolling after conventional acid pickling; annealing of primary finished products; annealing of final finished products; cooling, coating and finishing. According to the cold-rolled non-oriented silicon steel low in iron loss and the production method, by lowering the content of Als, the iron loss is further lowered; by annealing the finished products twice, the cold-rolled non-oriented silicon steel with the thickness being 0.35 mm, the iron loss P1.5/50 smaller than or equal to 2.0 W/kg and the magnetic inductivity B5000 greater than or equal to 1.67 T can be obtained, the rate of the finished products is high, and the cost is low.