The invention relates to the technical field of petrochemical products and particularly relates to a method for direct production of N-methylisopropanolamine from methylamine and propylene epoxide. The method comprises pumping the aqueous solution of methylamine into a reactor, slowly adding propylene epoxide into the reactor, carrying out mixing for a reaction, pumping the crude product obtained by the reaction into a rectification tower, adjusting rectification parameters of the rectification tower, and carrying out reflux separation several times to orderly remove the aqueous solution of methylamine and the middle fraction and to obtain the N-methylisopropanolamine product. The method fills the gap in high-efficiency production of N-methylisopropanolamine in the industry, realizes direct batch production of N-methylisopropanolamine only through the reactor and the rectification tower and has the advantages of high production efficiency and low production cost.