The invention discloses a reverse flow method for shrinkage fitting of a large sleeve type part. The reverse flow method comprises the steps as follows: step one, before the shrinkage fitting, the wind source air volume of the reverse flow method is confirmed; step two, after the sleeve type part is heated and subjected to thermal insulation according to processing requirements, the sleeve type part is taken out of a heating furnace and placed on a bracket; step three, a shaft is inserted into a sleeve type part from top to bottom, and no clearance is reserved in the shaft shoulder position; and step four, the air blowing is performed according to an air volume value confirmed in the step one, the air is forced to flow from top to bottom along the sleeve type part, so that a reverse flow is generated, the sleeve type part is cooled to be in a normal temperature state, and then the method is completed. According to the method disclosed by the invention, the air is forced to generate the reverse flow from top to bottom around the sleeve type part, so that the upper part of the sleeve type part is held firstly to form positioning, the zero clearance reserved in the shaft shoulder position is achieved, and the mounting accuracy of the sleeve type part is improved.