Abstract: The intelligent pantograph catenary on-line detection system can implement the on-line dynamic real-time detection of the main faults in metro train pantograph structure, pantograph contact point temperature, contact line structure and so on. The system combines the deep learning technology, image intelligent recognition technology, infrared thermal imaging technology, binocular measurement technology and other advanced detection methods, and therefore can realize the comprehensive detection of the pantograph and catenary operation state, ensure the operation safety and efficiency of metro line from the technology realization angle.