The invention relates to a disc-type solar stirling engine power generating device capable of operating continuously day and night. A bracket of a stirling engine of each disc-type solar stirling engine set is provided with a combustor and a position regulating mechanism for the combustor; the position regulating mechanism can be an expansion link (or a linkage capable of moving in a buckling mode) which performs linear motion; when the sunlight is too weak at night or cloudy, the power generator can not reach the rated revolution and can not output eligible electric energy, under the act of the position regulating mechanism, the combustor moves to the heated body of the stirling engine set, the heated body is heated by the ignition of fuels of the combustor, and the stirling engine set is driven to continue to generate electricity; and the gas fuel or liquid fuel required by the combustor is variable, especially the biomass combustible gas generated by a biomass gasification system (or a biomass combustible liquid generated by a biomass liquefied system) drives the stirling power generating set to generate electricity at night (or the sunlight is in short), and the device is alsoan advanced clean energy source power generating system. Through the device provided by the invention, the problems that the disc-type solar stirling engine set can not generate electricity at night,and the power generation in cloudy is not stable are solved.