Geological hazards on slopes pose a serious threat to the safety of people's lives and property. At the same time, it poses a great danger to construction and road traffic facilities. Traditional slope monitoring and early warning technologies have certain shortcomings in terms of information transmission, prediction efficiency and disaster handling capability. The emerging slope monitoring and early warning technology has certain technical uncertainties and high application costs. This paper investigates the current situation of the application of slope monitoring and early warning systems based on this problem. The advantages and disadvantages of various slope monitoring and early warning technologies are compared and analysed, the future development trend of the technology is judged and the current market application is analysed in detail. It is expected to provide some reference for the market application and forward-looking technology development of this technology.