The invention discloses a tower type solar photo-thermal and photovoltaic combined power generating system. The tower type solar photo-thermal and photovoltaic combined power generating system mainly comprises a heliostat, a heat absorbing device, a power generating device and a heat storage system, wherein the heliostat is provided with a light transmitting photovoltaic cell. The light transmitting photovoltaic cell is arranged above the heliostat and absorbs solar energy to conduct photovoltaic power generation. The heliostat reflects residual solar energy to the heat absorbing device, the heat of the heat absorbing device is transmitted to the heat storage system to be stored firstly, and the left part is directly used for power generation. When illumination is not enough, the heat storage system releases heat to generate power to working media of the power generating device. According to the tower type solar photo-thermal and photovoltaic combined power generating system, the photo-thermal power generation manner and the photovoltaic power generation manner are combined, the effect that the luminous energy can be absorbed and utilized many times can be achieved, and meanwhile power generation durability of the whole system can be improved.