The invention discloses a fast-heating wide-range thermogravimetric analyzer, which comprises a weighing system, a reaction system, a heating system, and a control system, the weighing system comprises a base cabinet and an electronic scale, the reaction system comprises a sample support, a sample-loading metal mesh, a high-temperature alundum tube, and a thermocouple for measuring sample temperature, and the heating system comprises an automatic lifter, a cooling water protector, a lower heat-insulating layer, a high-temperature heating furnace, an upper heat-insulating layer, and a sealing cover; and the control system is used for controlling gas intake, water flow in the cooling water protector, the furnace temperature and temperature adjustment of the high-temperature heating furnace and recording sample quality, sample temperature, gas intake and water flow data in real time. The thermogravimetric analyzer disclosed by the invention is low in pile-up effect and close to actual working conditions, the electronic scale is stable, the fast heating of high temperature can be realized, quality and temperature data measured by a wide-range sample isothermal method are accurate and stable, and the fast-heating wide-range thermogravimetric analyzer has the advantages of small error, convenience in operation, simple structure and the like.