The invention discloses a photo-thermal molten salt thermal storage Stirling electrical power generating system. The photo-thermal molten salt thermal storage Stirling electrical power generating system comprises a photo-thermal molten salt thermal storage device, and a Stirling power generator, the photo-thermal molten salt thermal storage device comprises a solar energy thermal collecting deviceand a molten salt tank (4), molten salt is stored in the molten salt tank (4), the solar energy thermal collecting device is connected to the molten salt tank (4) through a first molten salt pump, the Stirling power generator (7) comprises a hot end (5) and a cold end (8), the hot end (5) is connected to the solar energy thermal collecting device and the molten salt tank (4), and the molten salttank (4) is connected to the hot end (5) of the Stirling power generator (7) through a second molten salt pump. According to the photo-thermal molten salt thermal storage Stirling electrical power generating system, photo-thermal thermal collection and thermal storage of the solar energy thermal collecting device are achieved through high-temperature molten salt and the molten salt tanks, the non-integration external Stirling power generator is achieved, the complexity and installation difficulty of the disc-type photo-thermal Stirling electrical power generating system are reduced, and the stable power generation output of the Stirling power generator in all-day and all-weather conditions is achieved.