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The utility model discloses a sulfur vapor preparation device which comprises a sulfur melting device, a secondary sulfur heating device, a sulfur melt atomizing device and a sulfur vapor separation device, the sulfur melting device comprises a sulfur melting tank and a first heating device connected with the sulfur melting tank; the secondary sulfur heating device comprises a sulfur melt storage device and a second heating device connected with the sulfur melt storage device; a liquid outlet of the sulfur melt storage device is connected with the sulfur melt atomization device; an outlet of the sulfur melt atomization device is communicated with a liquid inlet of the separation device, and a liquid outlet of the separation device is communicated with the sulfur melt storage device; a gas outlet of the separation device is connected with a sulfur steam using device through a regulating valve; and high-efficiency low-temperature preparation of pure sulfur steam is realized.