The present disclosure provides a method and an Internet of Things system for gas usage safety warning based on a smart gas, the method is performed by a smart gas safety management platform of an Internet of Things system for gas usage safety warning based on a smart gas, comprising: based on gas usage data, determining a gas monitoring object from at least one gas device; determining initial objects based on the gas monitoring object and a gas usage threshold; determining a target object based on historical gas data of the initial objects; and sending gas usage safety warning information to a gas user corresponding to the target object.