Abstract: The accurate and rapid location of partial discharge radiation sources is significant for scientific analysis and early warning of electromagnetic interference and protection. In this paper, a method for visual annotation of partial discharge radiation sources based on pespective-3-point camera pose estimation is proposed, which utilizes the scene image information and electromagnetic radiation information. It is benefit for intuitive inspection and fast location of partial discharge radiation sources by labeling it in scene image. The partial discharge radiation source can be the visually labeled in the scene image after obtaining its 3D coordinates. The influence of partial discharge radiation source positioning error, camera pose parameter estimation error, and camera re-projection error on the accuracy of the labeling results are analyzed through overlap rate. High-voltage discharge experiment in which transient electromagnetic radiation is measured to verify the above analysis result. The measured results show that the labeling result has good directivity to the area where the high voltage discharge is located. In addition, the overlap rate of the circular labeling frame (radius 10 cm) and the reference frame is 0.67 and 0.72, respectively, which realizes the visual labeling of the partial discharge radiation.