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Content Delivery Network(CDN) has recently become one of the most popular research fields. To reduce the user access latency and improve the quality of service the network, the content prefetching technology is introduced based on the CDN cache technology in related studies. The prefetching technology can overcome the lag time between the demands for user request and content caching, and improve resource utilization of the CDN. In this paper, the classification of CDN prefetching techniques is summarized from the perspective of the different objects in prefetching. The advantages and weaknesses of different classifications are summarized and compared between each other, and various evaluation criteria are clarified in detail. Finally, the research direction of content prefetching in CDN with new networks and technologies is pointed out.