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At present, the method of removing foreign matter on overhead power transmission lines mainly relies on artificial means or control devices such as unmanned aerial vehicles. These methods are time-consuming, labor-intensive and can not be adapted to complex environments. With the application of laser technology more widely, using laser to remove foreign objects on wire has become a reality. In order to realize the cutting effect better and improve the cutting efficiency, the article presents a laser foreign body removal system based on servo control, combined with the digital image processing technology. By setting up a relatively fixed camera and laser emitting device on the two-degree-of-freedom turntable, the purpose of recognizing, tracking and removing the foreign object is achieved. The result of image analysis is used as feedback to control the rotation direction and angle of the turntable so as to determine the position of laser emission. In order to effectively determine the target, the foreign object recognition and tracking are carried out by the feature recognition method in the image processing technology. The Hough line detection is used to identify the cable and determine the cutting direction. Experiments show that in the case of turntable meet the accuracy of the target, the device can effectively remove the target within the scope of the specified foreign objects and can be adapted to more complex environments.