The invention relates to a non-oriented 
electrical steel plate without a corrugated defect and its manufacturing method. The steel plate is composed of the following chemical components by weight: less than 0.005% of C, 1.2-2.2% of Si, 0.2-0.4% of Mn, less than 0.2% of P, less than 0.005% of S, 0.2-0.6% of Al, less than 0.005% of N, less than 0.005% of O, and the balance Fe. The method comprises the steps of: subjecting the chemical components to molten iron pretreatment, converter 
smelting, RH refining and 
continuous casting so as to obtain a plate blank, and controlling the amount of 
continuous casting secondary cooling water, with the specific 
water flow of the cooling water maintained at 100-190l / min and the average superheat degree of 
continuous casting molten steel kept at 10-45DEG C; conducting heating and hot rolling to the plate blank, and making the tapping temperature of the plate blank at 1050-1150DEG C, and keeping the 
temperature difference between any two points along the length direction of the plate blank lower than 25DEG C during heating, with the hot rolling composed of rough rolling and finish rolling, the 
inlet temperature of which is controlled higher than orequal to 970DEG C; carrying out 
pickling, cold rolling, annealing and 
coating, thus obtaining the finished product of a non-oriented 
electrical steel plate. By controlling the 
cooling speed of the plate blank during continuous 
casting, the 
temperature difference along the length direction of the plate blank inside a 
heating furnace, as well as the 
temperature drop before finish rolling of the plate blank, the method of the invention realizes no corrugated defect.