The invention provides a tencel fiber and linen fiber blended yarn which comprises tencel fiber with the blending ratio of 70% and linen fiber with the blending ratio of 30%, and further provides a spinning process of the tencel fiber and linen fiber blended yarn. The process includes the steps of blowing-carding, drawing, roving, spinning and winding. Compact siro spinning is adopted as the spinning mode and combines the advantages of siro spinning and compact spinning, the evenness CV value, the slub index and the fine index are quite good, the single yarn is high in strength, the structureis compact, the wear resistance is high, the yarn hairiness is lower, harmful hairiness with the length of 3 mm or above is quite low, the yarn is bright and clean, the fabric quality is high, and theyarn is a high-quality yarn raw material for jean fabrics. The prepared blended yarn is a high-quality yarn which is environmentally friendly, elegant, comfortable and rich in style.