In order to explore the mechanism of oil mist deflagration accident in a confined space and the explosion consequences,a visual oil mist deflagration mechanism test experimental platform is designed and built.The process of functional requirement analysis of experimental platform-platform design and development-experiment design and implementation-data acquisition-experimental results analysis is adopted to develop the experimental platform,and the simulation experiments of oil mist deflagration accidents in various ship cabins,petroleum refining and chemical production processes and other industrial production can be carried out.The development law of oil mist deflagration is revealed by testing and analyzing the law of deflagration flame propagation,temperature field and pressure field in the cabin.The peak deflagrating pressure can reach 0.9 MPa.The deflagrating temperature is high and the peak temperature in the cabin reached 988℃,so the oil mist deflagrating is more destructive.The experiment enhances the intuitiveness,interactivity and multi-perception of the teaching process,improves the students'safety awareness and exploration ability to solve complex engineering problems,cultivates the students'practical innovation ability,and improves the quality of practical teaching.