Disclosed is a method for determining a continuous gas supply time based on smart gas, implemented by a smart gas management platform of an IoT system for determining a continuous gas supply time based on smart gas. The IoT system includes a smart gas user platform, a smart gas service platform, a smart gas sensor network platform, and a smart gas object platform. The method comprises: obtaining operation data, a time feature, and user feedback data; constructing a feature vector, and match the feature vector to a vector database to determine a gas flow trend of a low balance user; predicting a planned gas outage time; determining a gas outage influence value through a first model; determining the continuous gas supply time based on the gas outage influence value; and controlling the smart gas object platform to continuously supply gas to the low balance user using the valve control equipment.