The invention discloses shrinkage-free pipe expanding equipment, comprising an expansion rod and a clamping device, wherein the expansion rod can move along the axial direction thereof; the expansion rod comprises a pipe expanding part and a flaring part; the flaring part is located above the pipe expanding part; one end of the pipe expanding part is provided with an expanding head; the other end of the pipe expanding part is adjacently connected with the flaring part; the diameter of the flaring part is greater than that of the pipe expanding part; the clamping device is used for clamping a to-be-processed pipe. By applying the shrinkage-free pipe expanding equipment, the one-step completion of pipe expansion and flaring operation can be realized, so that the processing efficiency is improved; moreover, the equipment structure is simple, and the manufacturing cost is lowered; meanwhile, the shrinkage-free processing of the to-be-processed pipe can be realized through the clamping device; the material consumption is reduced greatly; the production cost is decreased; the product quality is improved.