Unmanned aerial vehicle (UAV) communications have attracted significant attention from both academia and industry.To facilitate the large-scale usage of UAVs for various applications in practice,we provide a comprehensive survey on the prototype and experiment for UAV communications.To this end,we first provide an overview on the general architecture of the prototype and experiment for UAV communications,and then present experimental verification for air-to-ground channel models and UAV energy consumption models.Next,we discuss measurement experiments on two promising paradigms of UAV communications,namely cellular-connected UAVs and UAV-enabled aerial communication platforms.For the former,we focus on the feasibility study and address the interference mitigation issue.For UAV-enabled aerial communication platforms,we present three scenarios,namely UAV-enabled aerial base stations,UAV-enabled aerial relays and UAV-enabled aerial data collection/dissemination.Finally,we point out some promising future directions for prototype and experimental measurements of UAV communications.