A high-efficient air floatation machine, comprising: an air floatation pool body, a spiral water input pipeline, a return pump, an inflation pipeline and a dissolved gas pipeline, characterized in that the air floatation pool body has a scum output pipeline matched and coupled to the top of the air floatation pool body, and a water output pipeline matched and coupled to the bottom of the air floatation pool body; the spiral water input pipeline has a chemical addition port a at a water inlet, and a chemical addition port b disposed at a middle section of the spiral water input pipeline, and an end of the spiral water input pipeline is matched and penetrated through the air floatation pool body; the return pump and the water output pipeline are matched, penetrated and coupled to each other, and the inflation pipeline and the return pump are matched and coupled to each other; and the dissolved gas pipeline is matched and coupled to the return pump and an end of the spiral water input pipeline; wherein the air floatation pool body has an upper cone at the top opening of the air floatation pool body and a lower cone at the bottom opening of the air floatation pool body, and an air floatation pool is formed and enclosed by the upper cone, air floatation pool body and lower cone; the scum output pipeline is matched, penetrated and coupled to the top of the upper cone, and the water output pipeline is matched, penetrated and coupled to the bottom of the lower cone; wherein the water output pipeline has a height adjustable upwardly with respect to the pipeline after the bottom of the lower cone is coupled to the outside; wherein the spiral water input pipeline has an end sheathed and coupled to the water output pipeline and penetrates perpendicularly upward from an interface between the water output pipeline and the lower cone and deeply into the air floatation pool body; wherein the spiral water input pipeline is passed deeply into an end of the air floatation pool body to form a double-layer trumpet structure; wherein the water output pipeline has a return pump inlet matched, penetrated and coupled to a return pump through a manual valve a; wherein the inflation pipeline comprises a manual globe valve a, a liquid flow meter, a Venturi tube, a pipe mixer and a manual valve b sequentially coupled to one another, and the Venturi tube is matched and coupled to an externally penetrating gas flow meter through an air pipe; wherein the dissolved gas pipeline comprises a check valve, a manual globe valve b, a dissolved gas pressure regulation can and a manual globe valve c sequentially coupled to one another; the return pump has an outlet matched and coupled to the check valve, and the check valve prevents flowing fluid from returning to the return pump; the manual globe valve c is matched, penetrated and coupled to an end of the spiral water input pipeline; and the dissolved gas pressure regulation can has a pressure gauge and a pressure relief valve disposed thereon and matched and coupled thereto. wherein the air floatation pool body has an upper cone at the top opening of the air floatation pool body and a lower cone at the bottom opening of the air floatation pool body, and an air floatation pool is formed and enclosed by the upper cone, air floatation pool body and lower cone; the scum output pipeline is matched, penetrated and coupled to the top of the upper cone, and the water output pipeline is matched, penetrated and coupled to the bottom of the lower cone; wherein the water output pipeline has a height adjustable upwardly with respect to the pipeline after the bottom of the lower cone is coupled to the outside; wherein the spiral water input pipeline has an end sheathed and coupled to the water output pipeline and penetrates perpendicularly upward from an interface between the water output pipeline and the lower cone and deeply into the air floatation pool body; wherein the spiral water input pipeline is passed deeply into an end of the air floatation pool body to form a double-layer trumpet structure; wherein the water output pipeline has a return pump inlet matched, penetrated and coupled to a return pump through a manual valve a; wherein the inflation pipeline comprises a manual globe valve a, a liquid flow meter, a Venturi tube, a pipe mixer and a manual valve b sequentially coupled to one another, and the Venturi tube is matched and coupled to an externally penetrating gas flow meter through an air pipe; wherein the dissolved gas pipeline comprises a check valve, a manual globe valve b, a dissolved gas pressure regulation can and a manual globe valve c sequentially coupled to one another; the return pump has an outlet matched and coupled to the check valve, and the check valve prevents flowing fluid from returning to the return pump; the manual globe valve c is matched, penetrated and coupled to an end of the spiral water input pipeline; and the dissolved gas pressure regulation can has a pressure gauge and a pressure relief valve disposed thereon and matched and coupled thereto.