A coal abnormal thermal conversion device which is used for coal-derived gas simulation comprises a combined insulating sleeve (1), a high-temperature and high-pressure thermal conversion cabin (2) and the like. The high-temperature and high-pressure thermal conversion cabin (2) is provided with the combined insulating sleeve (1). The high-temperature and high-pressure thermal conversion cabin (2), a four-way valve (5) and an air feeding pipeline (11) are connected in series. An air discharging pipeline (12), the four-way valve (5) and a safety valve (6) are connected in series. The high-temperature and high-pressure thermal conversion cabin (2) is provided with a single-lever heating rod (8). The coal metamorphism process under the condition of high temperature and high pressure can be simulated. At the same time the amount of the generated gas can be accurately measured. The growth characteristics of the cleat crack in each stage analyzed. The variation rules of the property of the accumulation layer are searched. The abnormal tectonic heat event caused by the thermal metamorphism function of the magma can be simulated. The control function of accumulation regulation of the coal-derived gas and tectonic heat event to the improvement, breakage and concentration of the coal-derived gas is researched.