The invention relates to a desulfurization spray gun with multiple reinforcing tubes. The technical scheme of the invention is as follows: 4-6 reinforcing tubes 1 are uniformly fixed on the external wall of a spray blowing tube 2 and are fixedly connected through reinforcing ribs 6, anchoring members 3 are uniformly welded to the external wall of each reinforcing tube 1 along the axial direction, and the lower end of the spray blowing tube 2 is vertically communicated with a spray hole inside tube 5; a refractory outer lining 4 formed through casting is integrated with the spray blowing tube 2, the reinforcing tubes 1, the spray hole inside tube 5, the reinforcing ribs 6 and the anchoring members 3; the upper end of the spray blowing tube 2 extends out of the upper end of the refractory outer lining 4, the spray hole inside tube 5 is arranged on the refractory outer lining 4 close to the lower end of the refractory outer lining 4, and end openings of the two ends of the spray hole inside tube 5 are located at the external wall of the refractory outer lining 4; the upper ends of the reinforcing tubes 1 are all level with the upper end of the refractory outer lining 4, the lower ends of the reinforcing tubes 1 are located above the spray hole inside tube 5, and the vertical distance from the lower ends of the reinforcing tubes 1 to the centerline of the spray hole inside tube 5 is 100-300mm. The desulfurization spray gun has the characteristics of simple structure and long service life.