Secondary water supply system

The utility model relates to the technical field of water supply, and provides a secondary water supply system which comprises a water tank, an upper-stage water pipe, a first water inlet pipe, a second water inlet pipe, a first control valve, a second control valve and a floating ball valve. The other ends of the first water inlet pipe and the second water inlet pipe are connected with the water inlet main pipe, the floating ball valve is connected with the water inlet main pipe, the first control valve is arranged on the first water inlet pipe, and the second control valve is arranged on the second water inlet pipe. The calibers of the first water inlet pipe, the second water inlet pipe, the first control valve and the second control valve can be selected according to different water inflow adjustment requirements, and the types of the first control valve and the second control valve can be selected according to different control requirements. The water inlet amount of the water tank is controlled through o