The invention discloses a reed type hydrodynamic ultrasonic gas-liquid-solid multi-phase mixer. The reed type hydrodynamic ultrasonic gas-liquid-solid multi-phase mixer comprises an upper cover, a lower bottom and a plurality of reeds. The upper cover and the lower bottom are detachably combined in a sealed mode to form a cavity. The multiple reeds are horizontally and fixedly arranged on the inner wall of the upper cover at intervals. The upper cover comprises a gas introduction pipe, a solid supporting frame and first nozzle passages. The lower bottom comprises a liquid introduction pipe and second nozzle passages. The tip end of any reed is opposite to the liquid outlet end of one of the second nozzle passages at the distance of 2-8 mm. Each second nozzle passage is of a narrow-seam structure 1-3 mm wide. The diameter of each first nozzle passage is 2-4 mm, and the first nozzle passages all enable gas to be sprayed towards one reed. Through introduction of the surrounding type reed structure and solid-phase materials, the atomization effect of the mixer is improved, the gas amount needed in the atomization process is lowered, and the reed type hydrodynamic ultrasonic gas-liquid-solid multi-phase mixer has the beneficial effects of being simple in structure, high in maneuverability, safe and reliable.