The invention provides a calorimeter querying method based on the complex Internet of Things (IoT) and an IoT system, and relates to the field of the IoT. The method comprises the steps as follows: when a first calorimeter in the plurality of calorimeters reads data information corresponding to a second calorimeter, the first calorimeter sends the data information to a management platform via a sensing network platform; the management platform sends a first control signal to the second calorimeter via the sensing network platform, thus allowing the second calorimeter to send a first prompt message; and a second prompt message is sent to at least one of the plurality of service sub-platforms; and one service sub-platform received the second prompt message sends the second prompt message toa user sub-platform corresponding to the second calorimeter. The calorimeter querying method based on the complex IoT and the IoT system provided by the invention can help a user to quickly find the own calorimeter, and are convenient for the user to query the own heating balance and recharge amount, and thus the user experience is enhanced.