The invention relates to a close-to-wall air system for a tangentially fired boiler, belongs to the technical field of boilers, and solves the problems of high-temperature corrosion and coking of an existing boiler water cooled wall and the problems that according to an existing close-to-wall air system, a nozzle is easy to coke and block, the air outlet direction of the nozzle cannot coordinate with a main firing tangential circle in the boiler, a close-to-wall air regulation mechanism is single, and the close-to-wall air volume cannot be locally regulated along with the change of combustionand wall face conditions. The close-to-wall air system for the tangentially fired boiler comprises an air box, adjusting dampers, air pressure difference measurement devices and close-to-wall air spray pipes, wherein the multiple rows and multiple columns of close-to-wall air spray pipes are arranged on the peripheral surface of a boiler wall; each close-to-wall air spray pipe stretches into a hearth; a close-to-wall air adjusting pipe is arranged at the inlet end of each close-to-wall air spray pipe; the air pressure difference measurement devices are arranged on the close-to-wall air adjusting pipes; the close-to-wall air adjusting pipes communicate with the air box; the adjusting dampers are arranged on the close-to-wall air spray pipes; and the nozzle direction of each close-to-wall air spray pipe is the same as the tangential direction, corresponding to a flue gas flow field, in the boiler.