The invention discloses a machining technology for batch production of thin and long deep-hole complex parts. The machining technology is characterized by sequentially comprising the following steps that 1, a blank is prepared; 2, the small end of each part is clamped, and the middle section of the part is turned as a technological external circle (2), the large-diameter end face is turned as a technological positioning face (22), and a positioning sleeve is used for positioning during clamping; 3, the technological positioning face (22) is used as a benchmark, the large-diameter end of the part is clamped, the end face and external circle of the small-diameter end are turned, and an inner hole of the small-diameter end is drilled; 4, the small-diameter end of the part is clamped, the steps that the large-diameter end external circle is turned, an inner hole is roughly turned, the inner hole is finely turned and an inner-side groove is turned are sequentially executed, and the positioning sleeve is used for positioning during clamping; 5, the technological positioning face (22) is used as the benchmark, the large-diameter end of the part is clamped, a machining center is used for milling all end faces, a polished hole and a screw hole are formed in the part, and a positioning block is used for positioning during clamping. During workpiece clamping, a special tool is used for clamping and positioning, and therefore the clamping precision and efficiency are improved.