The invention discloses a two-medium superheater screen of a supercritical circulating fluidized bed boiler and a using method. A working medium inside a circulating fluidized bed boiler furnace pipe screen below subcritical parameters is a superheated steam or steam-water mixture all the time, and the requirements of the supercritical circulating fluidized bed boiler on different operation conditions cannot be met. The using method comprises the steps that a circulating fluidized bed boiler combustion chamber (1) is involved, a water cooled wall (2) is arranged on the periphery of the circulating fluidized bed boiler combustion chamber, the water cooled wall is communicated with a two-medium superheater screen inlet collection box (4) through a water cooled wall outlet connecting pipe (3), the two-medium superheater screen inlet collection box is connected with a two-medium superheater screen heated face (5) installed in the circulating fluidized bed boiler combustion chamber, the two-medium superheater screen heated face is connected with a two-medium superheater screen outlet collection box (6), and the two-medium superheater screen outlet collection box is connected with a steam-water separator (8) through a steam-water separator inlet connecting pipe (7). The two-medium superheater screen is applied to the supercritical circulating fluidized bed boiler.