The invention discloses a mechanical digital printing machine, which is sequentially provided with a scotching cloth feeding device, a centering deviation correcting device, a brush hair box, a three-roller padder, a roller tube drying device, a plasma processing device, a four-color embossing machine, an infrared ray drying device, a lower layer guide belt, a two-color embossing machine, an upper layer guide belt drying box and a cropping device according to work procedures, wherein a fabric is flattened and is then fed into the deviation correcting device for carrying out centering cloth feeding, surface dust on the surface of the fabric is brushed, then, the fabric is fed into the three-roller padder for two-soaking two-rolling operation, and then enters the roller tube drying device, the fabric surface reaches a high dyeing degree through the plasma processing device, next, the requirement of front side embossing is reached through the four-color embossing machine, then, the reverse surface pattern is printed through drying the embossing surface, the humidity of the fabric surface is dried, and finally, the printed fabric uniformly falls onto the cropping device. After the whole work procedure, the fabric dyeing degree is high, the feeding and the discharging of a great amount of dye are avoided during embossing, the dye is saved, the pollutant emission is little, the printing speed is high, the printing quality is high, and the printed patterns are richer and more colorful.