The present invention discloses a method of manufacturing knitted fabrics, more particularly a method of skillfully transferring a painting artwork onto a knitted fabrics to show the artistic verve of the painting. The manufacturing method includes the steps of: inputting an original drawing into a computer for digitization; editing and designing the digitized original drawing on a knitted fabric; outputting a knitting square plot after a graphic software performs a color processing; introducing graphic file information analyzed and processed by a knitting software to a knitting machine; and operators following a lamp signal of the knitting machine and the knitting square plot to knit to shape a knit piece, so as to complete a fashioned fine-art knitted fabric.