Waste organic solvents are designated waste discharged after use at workplaces, and about 90% are generated by manufacturing, followed by sewage, waste treatment, raw material regeneration and environmental restoration, transportation, and professional, science, and technology services, and the generation and recycling rate of waste organic solvents are increasing every year. As a result, the number of fires and accidents at recycling companies for waste organic solvents is also increasing, and fires are occurring due to various causes such as carelessness (welding and cutting operations) and chemical factors (natural ignition, horn ignition, etc.). In addition, if a fire occurs, it may lead to a large fire accompanied by an explosion, and it is a great threat to the safety and health of citizens because it generates a large amount of harmful chemicals harmful to the human body. Therefore, this study was conducted to contribute to the prevention of fire and explosion accidents caused by waste oil solvents and to suggest ways to improve fire-related identification techniques and systems through the risk study and fire cases.