Precision assembly position detection includes orientation error detection and positioning error detection.In actual production,precision component assembly lacks an adaptive detection method and often requires a large amount of manual investment.Aiming at the problems of low efficiency and poor accuracy in traditional precision assembly position detection,a machine vision position detection method based on line structured light is proposed.Through line structured light,the depth characteristics of the tested part are provided；by translating and rotating the tested assembly parts,the image scanning of the assembly area is completed.This paper mainly introduces the application of wire structured light in the detection of conductive slip ring brush wire pairs.The experimental results show that compared with the traditional manual detection,the accuracy of the method is guaranteed,and the detection efficiency is significantly improved.