Abstract: The scientific significance of small-body exploration missions is comprehensively investigated, the technical challenges and performance metrics associated with sampling missions are systematically analyzed, the progress of robotic sampling missions both domestically and internationally is surveyed, and the sampling principles and design mechanisms of various robotic samplers are elaborated. Furthermore, considering the highly uncertain sampling environments of small bodies, a quantitative evaluation method based on the spider-web model to assess the comprehensive sampling capability of each sampler is proposed. Finally, lessons learned from previous small-body sampling missions are thoroughly analyzed, and future development directions for robotic sampling technologies are discussed.