The utility model discloses an oil bath formula coal low -temperature oxidation test system, including 1) gas supply system, constitute by gas cylinder, mass flow meter and mixing chamber, 2 )Intensification / constant temperature system comprises coal sample jar, intensification case, heat transfer medium (liquid) and procedure control by temperature change table, 3 )The gas chromatograph appearance, 4 ) data acquisition system. During the mist that produces specific ratio, flow by gas supply system got into the coal sample jar of intensifications / constant temperature system, the analysis was carried out with the gaseous entering gas chromatograph appearance that mist emergence low -temperature oxidation produced to the coal sample under temperature programming or constant temperature condition, notes the experimental data by data acquisition system at last. The mainly used of this system analysis coal is at the oxidation gas composition and the concentration change rule in low temperature stage. This system adopts liquid as heat transfer medium according to liquid specific heat is big, coefficient of convective heat transfer big and the more even characteristic of distribution of temperature for being heated of coal sample jar is more even, has improved the experiment measuring accuracy greatly.