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At present, there is no automatic water-washing vehicle for contact line insulator in the field of railway insulator maintenance. This paper presents a system of acquisition tracking and pointing to automatic water-washing maintenance of insulators. On the basis of insulator recognition, to further design a visual servo system based on image (IBVS, Image-Based Visual Servoing) control method, the method adjust the pose of flushing tube and camera aiming the insulator to complete the water-washing work. The main idea of this method is that writing characteristic function and difference between two characteristic functions and making it minimal. The characteristic function establishes the relation between the image and the control quantity of the washing device through two Jacobi matrix and its pseudo inverse matrix, finally achieving control purposes.In this paper, IBVS control method is verified in MATLAB, which control two degrees of freedom flushing device and the accuracy meets the requirement. The control method can realize the automatic water-washing and aiming of insulators.