A Cloud of Things online monitoring general platform system, comprising a data acquisition system (100), a cloud data centre (200) and a client (300). The data acquisition system comprises an on-site hardware apparatus for data acquisition and transmission, and embedded software running on an acquisition panel (120) therein. The cloud data centre comprises a computer device and a software system for data storage and cloud service. The client comprises a computer and a mobile terminal, the client being located at a user end and communicating with the cloud data centre, so as to send a request to a data storage and cloud service system for performing information query. The Cloud of Things online monitoring general platform system is suitable for environment online monitoring, disaster prevention online monitoring and production online monitoring, etc., such as water quality online monitoring, water level and rainfall amount online monitoring, plant environmental hygiene online monitoring and for an industrial 4.0 platform, an agricultural Internet of Things, vehicle and vessel transport real-time monitoring and smart homes, etc.