The invention discloses a line knife switch state monitoring method, which comprises the following steps: obtaining sample pictures of a line knife switch under different working states; extracting image features of the sample pictures, and training an SVM classifier based on the image features; and obtaining working pictures of the line knife switch in real time, and inputting the working pictures to the SVM classifier to obtain the current working state of the line knife switch output by the SVM classifier. According to the technical scheme, the current working state of the line knife switch is determined in real time and effectively without human intervention through the pre-trained SVM classifier, thereby preventing the case that the working state of the line knife switch cannot be obtained accurately due to staff negligence and detection miss, and greatly improving accuracy of the working state monitoring of the line knife switch.