The present invention provides a gas energy-saving prompting method based on a compound Internet of Things (IoT) and an IoT system, and relates to the field of energy consumption. The gas energy-saving prompting method based on the compound Internet of Things (IoT) and the IoT system generate the monthly normal gas usage amount associated with each user sub-platform based on the information on family size, family members' ages, geographic location and seasons sent by each of the user sub-platforms as well as the pre-trained neural network algorithm model. When the management platform judges that the monthly actual gas usage amount of the user is greater than the monthly normal gas usage amount, a gas overconsumption prompt is generated. The calculated monthly normal gas usage amount meets the practical requirements, with high reliability and reference value, so that the system targets to remind an individual family to save gas, but not stop the supply of gas or send a prompt in a whole area, improving the user experience.
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