The invention belongs to the technical field of water-jet cleaning, particularly relates to a cavitation injecting nozzle with a resonant cavity, and aims to solve the problems in the prior art that the working efficiency is low and the safety performance is poor; the cavitation injecting nozzle with the resonant cavity comprises a nozzle body, a clamping groove, a water inlet cavity wall thread, a left-right water inlet cavity, the resonant cavity and a water outlet cavity, wherein the water inlet cavity is circular truncated cone-shaped, the larger bottom surface of the water inlet cavity is positioned at one end of the inner side, where the water inlet cavity wall thread is positioned, of the nozzle body, and the smaller bottom surface is communicated with the resonant cavity; the resonant cavity is positioned between the water inlet cavity and the water outlet cavity and takes the shape of a cylinder with a circular truncated cone-shaped sunk part; the sunk part of the resonant cavity is communicated with the smaller bottom surface of the water outlet cavity; the water outlet cavity is circular truncated cone-shaped, and the smaller bottom surface is communicated with the bottom end of the sunk part of the resonant cavity. According to the cavitation injecting nozzle with the resonant cavity, the design is reasonable, the pressure of the water jet flow is strong, the impacting and crushing effect on an object subjected to water jetting is good, the service life is long, the working efficiency is high, and the safety performance is good.