The invention discloses a dry heat rock photothermal coupling power generation system with a heat storage function and a control method system thereof. The dry heat rock photothermal coupling power generation system comprises a dry heat rock circulation subsystem, a photothermal circulation subsystem and a power generation subsystem; the photothermal circulation subsystem includes a photothermal working fluid pump, a heat collector and a heat storage unit; an outlet of the heat collector is divided into two paths, one path is connected to a first inlet of a high temperature heat exchanger, anda first outlet of the high temperature heat exchanger is connected to an inlet of the heat collector; the other path of the outlet of the heat collector is connected to the heat storage unit to be used for storing excess heat when the light is sufficient, and the heat storage unit is also connected to the high temperature heat exchanger to be used for preheating a medium of the high temperature heat exchanger when no illumination exists; and the three systems cooperate and do cycle reciprocation, and continuous power generation of the dry heat rock photothermal coupling power generation system with the heat storage function is achieved. The system effectively solves the problems that pure dry heat rock power generation temperature is low, the photothermal power generation cost is high, and the floor space is large.