The invention provides a nonhydrocarbon gas and steam shaft state simulating experiment device. The device comprises a seal kettle, a nonhydrocarbon gas injection system, a steam injection system, a drain water receiver and an exhaust gas receiver; a chamber is formed in the seal kettle, and the seal kettle is provided with a heating device for heating the chamber; a temperature probe and a pressure probe are arranged in the chamber; the nonhydrocarbon gas injection system and the steam injection system are connected with the seal kettle through pipelines; the drain water receiver and the exhaust gas receiver are connected with the seal kettle through pipelines. The invention further provides an experiment method, dynamic conditions for injecting nonhydrocarbon gas and steam into a shaft can be dynamically simulated, and objective condition changes caused by the conditions such as reaction consumption and system heat loss in the seal kettle under the actual dynamic condition are simulated. A measurable processing system accurately simulates state parameters such as the temperature, the pressure, the gas composition and the dryness degree of any one point in the shaft through corresponding monitor and calculation simulating.