A micro-bubble spray head , comprising a spray pipe and a micro-bubble bubbler fixed at an outlet end of the spray pipe ; wherein a diameter-decreased conical passage part and a mixing cavity are provided in the spray pipe ; there is an at-least-one-stage diameter-decreased conical passage in the diameter-decreased conical passage part in a water flow direction; a throttling hole is arranged at a downstream end of the diameter-decreased conical passage part , and a diameter of the throttling hole is smaller than a diameter of the mixing cavity , so that a water flow is sprayed into the mixing cavity through the throttling hole and generates a negative pressure in the mixing cavity ; and the outlet end of the spray pipe and the micro-bubble bubbler are respectively provided with suction ports that can communicate with each other so that air can be sucked into the mixing cavity through the suction ports by means of the negative pressure and mix with the water flow to form bubble water; and the bubble water is cut and mixed by the micro-bubble bubbler to form micro-bubble water, wherein the micro-bubble bubbler comprises a multi-layer filter screen and a screen bracket for fixing the multi-layer filter screen , wherein the micro-bubble bubbler further comprises a pressure ring , and the pressure ring is placed between an end face of the outlet end and the screen bracket so as to abut the multi-layer filter screen against the screen bracket , characterized in that a plurality of spaced apart bosses extending outward in an axial direction are respectively formed on two axial end faces of the pressure ring so that a groove is formed between the adjacent bosses . wherein a diameter-decreased conical passage part and a mixing cavity are provided in the spray pipe ; there is an at-least-one-stage diameter-decreased conical passage in the diameter-decreased conical passage part in a water flow direction; a throttling hole is arranged at a downstream end of the diameter-decreased conical passage part , and a diameter of the throttling hole is smaller than a diameter of the mixing cavity , so that a water flow is sprayed into the mixing cavity through the throttling hole and generates a negative pressure in the mixing cavity ; and the outlet end of the spray pipe and the micro-bubble bubbler are respectively provided with suction ports that can communicate with each other so that air can be sucked into the mixing cavity through the suction ports by means of the negative pressure and mix with the water flow to form bubble water; and the bubble water is cut and mixed by the micro-bubble bubbler to form micro-bubble water, wherein the micro-bubble bubbler comprises a multi-layer filter screen and a screen bracket for fixing the multi-layer filter screen , wherein the micro-bubble bubbler further comprises a pressure ring , and the pressure ring is placed between an end face of the outlet end and the screen bracket so as to abut the multi-layer filter screen against the screen bracket , characterized in that a plurality of spaced apart bosses extending outward in an axial direction are respectively formed on two axial end faces of the pressure ring so that a groove is formed between the adjacent bosses . <EOS>