The invention discloses a method of using firedamp and solar energy as the power resource of thermoelectric generating system. Wherein, using solar energy collector to attain the hot water above 100Deg. C; using heat exchange tube to heat the firedamp generator to keep the ferment temperature inside the firedamp generator at 55-60Deg. C, to attain the high-quality firedamp while the firedamp generate rate is 2.5-3.5m3/m3 each day; the firedamp can be used as the power resource of thermoelectric generator. Said device comprises a solar energy collector, a firedamp reactor, and a steam generator. The invention realizes generating firedamp at high temperature to confirm the energy of ferment pool, while the firedamp yield of people shit is 0.43m3/kg, the firedamp of raise yield is 0.12-0.35m3/kg; and the firedamp yield at high temperature as 45-55Deg. C inside the firedamp ferment pool (digest device) is 2.5-3 times of ferment pool at lower temperature (<35Deg. C). The invention can be used at the industry workshop and the country.