Abstract: Residual coal in goaf immersed in water in a long time is easier to exhibit spontaneous combustion once the water is removed. In order to study oxidation and spontaneous combustion properties of coking coal after long-term water immersion, taking the 4# coal in Xiqu Coal Mine as the research object. After long-term water immersion from 30 d to 90 d, coal specimens were dried under the condition of 25 ℃ in vacuum drying oven after 72 h, the oxidation and spontaneous combustion properties were compared by programming temperature, infrared spectroscopy, specific surface area and pore analysis test. The results show that the coal is easier to self-ignite after long-term immersion and dried. It produced more products such as CO and CO₂ during programming temperature. Besides, it produces more pores and fractures, hole diameter, specific surface area and pore volume increases with increasing water immersion time, but the extent of increase gradually decreased. In addition, the -OH, -CH₂, -CH₃, C=O functional groups in coal increase. Long-term water immersion on the coking coal spontaneous combustion has a certain role in promoting.