Vacuum tube type steam sterilizer and sterilization method thereof

The invention relates to the technical field of sterilization equipment, in particular to a vacuum tube type steam sterilizer and a sterilization method thereof. The vacuum tube type steam sterilizer comprises a sterilizer body, the sterilizer body is fixedly arranged on a rack, a platform or a floor through a support, a rock wool heat preservation layer is arranged in the sterilizer body, the outermost side of the sterilizer body is wrapped with 304 stainless steel, the sterilizer body is provided with an inner container, the inner container is higher than the upper end of the 304 stainless steel and lower than the lower end of the 304 stainless steel, cover plates are arranged at the upper end and the lower end of the inner container, holes are formed in the cover plates, and material pipes penetrate through the cover plates; a pressure-bearing loose joint and a feed port are welded at the starting end of each material pipe, and a pressure-bearing loose joint and a discharge port are welded at the tail end