The invention relates to a flue gas continuous monitoring electronic cooler which mainly comprises an acid and alkali resistance borosilicate glass tube 1, an aluminum-made aluminum core 2, a semiconductor cooling plate 3, a radiating fin 4, a closed plate 5, a cooling fan 6, a box body 7, a PID (PID control) temperature controller 8, a solid state relay 9 and a platinum resistance temperature sensor 10. The temperature of the acid and alkali resistance borosilicate glass tube 1 (namely flue gas to be tested) is accurately controlled by the PID (PID control) temperature controller 8. The PID (PID control) temperature controller 8 can set a temperature value, and has the functions of alarm, code setup, remote control, communication with other equipment, and the like. The device has the advantages of high efficiency, low energy consumption, low cost, little noise, small volume, light weight, no pollution, fast cold and hot exchange speed, high temperature control accuracy, and the like, is widely applied to the field of dewatering and drying treatment for exhaust source flue gas extracted by a fixed pollution source continuous monitor system.