Natural dye dyeing process for worsted wool

The invention provides a natural dye dyeing process of worsted wool. The process comprises the following steps: 1) wool top pretreatment: adding a permeation defoamer, a degreaser and soda ash, and keeping the temperature at 50 DEG C for 20-30 minutes; 2) wool top dyeing: adding a permeation defoamer and a dye, keeping the temperature at 90-98 DEG C for 30-60 minutes, and then lowering the temperature to 35 DEG C; 3) iron medium dyeing: adjusting the pH value of a dye bath to be less than 4 at 35 DEG C, adding ferrous sulfate, and keeping the temperature at 40 DEG C for 20-30 minutes; 4) for dark color, dyeing wool tops again, adding a dye, keeping the temperature at 90-98 DEG C for 30-60 minutes, and then lowering the temperature to 35 DEG C; 5) for the dark color, dyeing with an iron medium again, adjusting the pH value of the dye bath to be less than 4 at 35 DEG C, adding ferrous sulfate, and keeping the temperature at 40 DEG C for 20-30 minutes; and 6) soaping: adding a soaping agent for dark color, and k