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During mode-I crack development of sandstone flattened Brazilian disk (FBD) specimen, the thermocouple multi-channel temperature measuring instrument is used to measure the temperature variation. The thermal infrared imager is also used to measure the infrared radiation temperature variation. In the thermocouple multi-channel temperature test, about 95% of the specimens have experienced stress change at crack initiation. Meanwhile, there is a sudden increase in physical temperature. The maximum temperature increases by 0.74°C and the average temperature increases by 0.16°C. In the test by thermal infrared imager, about 20% of the infrared radiation temperature rises at crack initiation (the average temperature increases by 0.03°C). The experimental results show that the physical temperature measurement technology and infrared temperature measurement technology can capture the temperature variation in crack development before coal and rocks fail. The results can be applied in mining engineering, such as crack development in water-preserved mining, rock strata control and so on.