The invention discloses a dyeing technology of a colorful twill. The dyeing technology comprises the following steps of adding 8% of high-elastic spandex yarns when 45% of polyester and 47% of artificial cotton twill are weaved, pretreating, adding 1% of deoiling agent, 2% of sodium carbonate and 1% of hydrogen peroxide, heating to 90 DEG C, maintaining for 20min, continuing to add 0.2% of glacialacetic acid, and maintaining for 6min at the temperature of 60 DEG C; dyeing the polyester into fresh color, and dyeing the cotton fabric into deep color, so as to form the polyester/cotton color difference with strong vision feel; finally, shaping at the rate of 150DEG C*26-code/min, and adding silicone oil to soften in the shaping process. The dyeing technology of the colorful twill has the advantages that the cost is low, the dyeing effect is good, the fastness to color is good, and the technology is simple.