Annular water supply system for multiple areas

The annular water supply system comprises a water injection header pipe, a first vertical pipe and a second vertical pipe, and the first vertical pipe and the second vertical pipe are connected through a connecting pipe fitting to form a vertical pipe annular loop; the lower ends of the first vertical pipe and the second vertical pipe are connected with a water outlet of the water injection header pipe; a plurality of main pipes are arranged on the first vertical pipe at different heights so that water can be supplied to water using areas at different floor heights, the water outlet end of each main pipe is connected with a branch pipe loop, each branch pipe loop is a closed loop composed of a plurality of branch pipes which are connected with one another, each water using area is provided with at least one or more water using point water outlets, and the water using point water outlets are communicated with the main pipes. And the water outlet of the water using point is arranged on the main pipe or the bran