The invention discloses a centrifugal nozzle with a reed added at an outlet of a tangential hole and a spray method. The centrifugal nozzle comprises a swirl chamber formed by a swirl chamber head, a swirl chamber wall and a nozzle bottom cover which are sequentially connected, wherein a spray port is formed in the nozzle bottom cover; a gas collecting cavity is formed in the periphery of the swirl chamber wall; a liquid collecting cavity is formed between the outer side of the swirl chamber head and a nozzle head cover; the tangential hole is formed in the swirl chamber head; an inlet of the tangential hole corresponds to the liquid collecting cavity; the outlet of the tangential hole corresponds to the swirl chamber; the reed is arranged at the outlet of the tangential hole; and a spray hole inlet is formed in the nozzle head cover. During working of the nozzle, the pressure of a liquid inside the swirl chamber of the nozzle rises slowly, the differential pressure between the upper surface and the lower surface of the reed is gradually reduced, the reed returns to the original position by the aid of the own elastic force, the tangential hole of the nozzle is shielded, the pressure inside the nozzle is reduced, the reed is opened, the process is repeated, pulsation of the pressure and the flow inside the swirl chamber of the nozzle is aroused, and improvement of atomization is facilitated by unstable oscillation of the internal structure of the nozzle.