The invention discloses an insulator candidate target area generation method and system. The method comprises the following steps of: obtaining a to-be-detected image; preprocessing the to-be-detected image and removing interference information to obtain a processed first image; extracting image edge of the first image to obtain a profile curve; determining a curvature scale space angular point of the profile curve; determining a position coordinate of the a curvature scale space angular point; determining a curvature scale space angular point positioned on an insulator according to a K-means clustering algorithm and the position coordinate of the curvature scale space angular point and taking the curvature scale space angular point as a target curvature scale space angular point; drawing a closed picture at the target curvature scale space angular point to obtain a processed second image; and inputting the second image into a scoring system of Edge Boxes and outputting a candidate target area of the insulator by the scoring system of the Edge Boxes. The insulator candidate target area generation method and system provided by the invention have the characteristics of being high in efficiency and high in correctness.