Provided are a forming mold for a tube hole flanging and a forming process therefor. The forming mold comprises a plurality of inner molds (1) and a push rod component (2); at least a part of the plurality of inner molds can freely enter a pipe fitting to be processed (3), the push rod component can freely enter said pipe fitting, and a preset bottom hole (31) is provided on a pipe wall of said pipe fitting. In cases where both the push rod component and a selected inner mold enter said pipe fitting, the push rod component pushes the selected inner mold to move towards the preset bottom hole at a position corresponding to the preset bottom hole, and the selected inner mold presses the preset bottom hole so as to form a flange. By means of such a mold, flanges of different heights can be formed, thereby solving the problems that flanging is performed on a certain bottom hole by means of a hole drawing process using a hole drawing hook, and a flange of only one height is formed, having a certain limitation. Furthermore, the forming mold is not limited by the size of the preset bottom hole on said pipe fitting, thereby expanding the usage range.
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