The invention discloses a tower type solar energy photo-thermal power generation combined circulatory system and an operation method thereof. The circulatory system includes a water working medium condensation heat collection unit, a molten salt working medium condensation heat collection unit, a heat storage and transfer unit and a power generation unit, the water working medium condensation heatcollecting unit and the molten salt working medium condensation heat collecting unit are arranged in parallel, the heat storage and transfer unit includes a heat storage subunit and a heat transfer subunit, an outlet of the water working medium condensation heat collection unit is connected with a steam mother pipe of the heat storage and transfer unit, the molten salt working medium condensationheat collection unit is connected with the heat storage subunit, the heat storage and transfer unit is connected with the power generation unit, and second superheated steam generated by the heat transfer subunit and/or first superheated steam generated by the water working medium condensation heat collection unit is fed into the power generation unit through the steam mother pipe for power generation. The operation method lies in operation control of the circulatory system. According to the tower type solar energy photo-thermal power generation combined circulatory system and the operation method thereof, power station circulatory system arrangement and auxiliary system configuration can be simplified, the investment cost is lowered, continuous power generation all day long is realized,the operation time is prolonged, and the yield is improved.