The invention provides and discloses a dyeing and finishing process of cotton / wool blended fabric.The process includes the steps of 1, singeing; 2, one-bath desizing-scouring-bleaching; 3, shrink-resistant finishing; 4, pre-setting; 5, mercerizing; 6, dyeing; 7, fixation; 8, padding; 9, drying; 10, baking; 11, setting; 12, rolling.The one bath process is adopted for dyeing, and dyeing steps are simplified.The cotton / wool blended fabric is dyed at the same time through double-active-radical type active dye, dyeing steps are effectively simplified, and working efficiency is improved by 15-20%.In the dyeing procedure, the temperature and the temperature rise speed are strictly controlled, so that it is guaranteed that the strength and whiteness of the fabric are slightly affected; a high-temperature leveling agent is added to the dye, so that the situation that heat-resisting stability of fuel is reduced due to rise of the temperature, then dye is gathered, and leveling and deep dyeing effects are affected is avoided, dyeing problems such as color dots and color patches are avoided, and the dyeing effect is good.