We present a technical research experimentally demonstrating automated alignment on off-axis eight-pass laser amplifier. The mentioned technique aims to replace manual alignment method with automatic alignment system on the multipass complex laser amplifier, of which the efficiency, accuracy, and output beam quality would improve spectacularly. This technique realizes precise reference mark of pinhole spatial centre position in the spatial filter of the off-axis eight-pass laser amplifier via main laser lighting and image relaying system. The far-field facula is processed by edge detection so that the beam pointing centre is obtained. Based on the difference between the beam centre position and reference, we realizes closed loop automated alignment on the amplifier system via two-dimensionally controlling specific reflector frames. Additionally we indicate that the experimental results of the research fairly satisfied requirements for efficiency and accuracy of the off-axis eight-pass laser amplifier, and verified feasibility of the alignment technique applied in the amplifier as well.