Abstract: Different kinds of real-time monitoring and regular "physical examination" for buildings of different ages and types can help to find hidden safety hazards, avoid accidents, achieve the purpose of early warning and timely maintenance, improve the durability of buildings, facilitate green development, and protect the safety of people's lives and property. This paper put forward the whole life cycle management mode of the house, discussed the frame, operation mode and service content of the building safety operation and maintenance service system based on the Internet of Things, defined the subsystems and corresponding functions of the building safety operation and maintenance service system based on the Internet of Things, and developed the WeChat service account "Building Safety Guard", the big data acquisition and monitoring platform based on the Internet of Things, building safety assessment system/safety early warning and auxiliary decision-making system, this paper briefly introduced the application of Bayesian network, deep neural network and other advanced algorithms in building safety assessment, as well as the key techniques of automatic health monitoring platform based on Internet of Things, so that the system could provide all kinds of real-time services and professional services for all kinds of users to complete the goal of construction safety operation and maintenance services, to promote the establishment of building security management system, to help the construction of smart towns, and to form a full cycle closed loop of urban development based on effective monitoring and evaluation and safety maintenance management.