The invention belongs to an integrated tubular reaction device and a reaction method thereof. The reaction device comprises a main material tank and a secondary material tank, the main material tank is connected with a main material feed opening of an integrated tubular reactor through a material pump, the secondary material tank is connected with a secondary material feed opening of the integrated tubular reactor through a metering pump, and a discharge opening of a pipeline mixer of the integrated tubular reactor is connected with a material using device; the integrated tubular reactor comprises an outer barrel and the pipeline mixer arranged on one side of the outer barrel, a material reaction pipe is arranged inside the outer barrel, one end of the material reaction pipe serves as the main material feed opening, the other end of the material reaction pipe is connected with a feed opening of the pipeline mixer, a feeding hole is formed in the pipe wall of the material reaction pipe, the secondary material feed opening is formed in the outer surface of the outer barrel, and the feeding hole formed in the material reaction pipe is connected with the secondary material feed opening through a pipeline. The integrated tubular reaction device and the reaction method thereof have the advantages that the structure is simple, the design is reasonable, mixing and reacting are uniform, and the product quality is guaranteed on the premise of saving resources.