With the rapid development of cloud computing and Internet of Things (IoT) technology, intelligent cloud gateway emerges as a key hub connecting end devices and cloud services. This paper elaborates the background, concepts and definitions of the emergence of intelligent cloud gateway, and discusses in depth its main technical capabilities, including data acquisition and processing, protocol conversion, security protection and other aspects. Meanwhile, it analyzes the industrial status quo of intelligent cloud gateway, covering market size, major vendors, etc., and looks forward to its future development trend. By comprehensively citing and analyzing the related literature, it provides a comprehensive reference for the research and application of intelligent cloud gateway.