For the past few years, the electronic information industry has been developing rapidly. As a support, the production scale of connectors has been enlarged a lot．Due to the increasingly strict requirement from electrical device factories, connector inspection is getting more and more attentions. Machine vision detection technology has been applied to the inspection of connector quality widely because of the advantages of high speed and stability. This paper introduces the application of the machine vision inspection technology in online quality detection system for electronic connectors, takes the typical stamping quality defects detection as an example to expound the structure of the system, core processing parts, the problems existing in the application and innovative methods to solve the problems, and finally analyses the reliability of the existing system.