The invention relates to the technical field of dyeing, in particular to a tencel and linen-cotton blended fiber dyeing method. The method comprises the steps that pretreatment is conducted, wherein blended fibers and water are added into a dye vat, hydrogen peroxide, SD-1 and sodium silicate are added, the temperature is increased to 98 DEG C, and heat preservation is conducted for 60 min; the temperature is decreased to 30 DEG C, a deoxidizing enzyme is added, and dyeing is conducted after heat preservation is conducted for 20 min; auxiliaries and dye are added, heat preservation is conducted for 10 min, the temperature is increased to 50 DEG C, and heat preservation is conducted for 15 min; 1/10 of anhydrous sodium sulphate is added, heat preservation is conducted for 10 min, 3/10 of anhydrous sodium sulphate is added, heat preservation is conducted for 10 min, 6/10 of anhydrous sodium sulphate is added, and heat preservation is conducted for 10 min; the temperature is increased to 60 DEG C, heat preservation is conducted for 15 min, 1/10 of sodium carbonate is added, heat preservation is conducted for 10 min, 3/10 of sodium carbonate is added, heat preservation is conducted for 10 min, 6/10 of sodium carbonate is added, and heat preservation is conducted for 10 min; washing is conducted to be clean, the temperature is decreased to 30 DEG C, glacial acetic acid is added, heat preservation is conducted for 10 min, a soaping agent is added, the temperature is rapidly increased to 80 DEG C, heat preservation is conducted for 10 min, washing is conducted to be clean, the temperature is cooled to 30 DEG C, a softening agent is added, the temperature is increased to 40 DEG C, heat preservation is conducted for 20 min, and the product is taken out of the dye vat. According to the tencel and linen-cotton blended fiber dyeing method, color fastness can be effectively improved, and dyeing defects are not prone to occur.