The invention provides a reclaimed rubber desulfurization machine used for reclaimed rubber formula testing which can save single test materials and time. The reclaimed rubber desulfurization machine comprises a steady feeding device, a helical conveying device and discharge cooling devices. The helical conveying device comprises a first heating device, a second heating device, a first insulation device and a second insulation device; the discharge cooling devices comprise a first discharge cooling device and a second discharge cooling device, wherein a discharging port of the second insulation device is connected with a feeding port of the first discharge cooling device, and a discharging port of the first discharge cooling device is connected with a feeding port of the second discharge cooling device; both the first discharge cooling device and the second discharge cooling device comprise helical shaft conveying devices, water cooling devices, cooling water adaptors and driving devices, wherein the water cooling devices are arranged outside of the helical shaft conveying devices, and the helical shaft conveying devices are connected with the driving devices. The reclaimed rubber desulfurization machine has the advantages that only a small amount of waste rubber and additives are needed to achieve desulfurization every time, and the materials and time of formula testing are saved.