The invention provides a rotary shearing cavitation nozzle, and belongs to the technical field of water jets. The rotary shearing cavitation nozzle comprises a nozzle main body, a first support, a second support, a central body, a rotary shearing cylinder, a driving motor and a universal shaft; the nozzle main body is of a hollow rotating body structure, and the inner diameter of the water inlet end is larger than that of the water outlet end; the first support and the second support are oppositely and rotationally mounted in the nozzle main body, and the two ends of the central body are rotationally mounted on the first support and the second support respectively; the central body is sleeved with the rotary shearing cylinder, and the two ends of the rotary shearing cylinder are fixed to the first support and the second support respectively; the output end of the driving motor is connected with the input end of the universal shaft, and the output end of the universal shaft is connected with the second support. According to the nozzle, the outside of the central body of the central body type nozzle is coaxially sleeved with the rotary shearing cylinder, and the jet flow between the rotary shearing cylinder and the central body generates a speed gradient in the radial direction due to high-speed rotation of the rotary shearing cylinder, so that the maximum principal stress in liquid becomes tension, and the liquid is severely cavitated.