Heat shrink tube expansion device

The utility model discloses a heat shrink tube expansion device, including expansion sizing mould, heating sleeve, air supply subassembly and vapor supply device, wherein the inside of expansion sizing mould is provided with the indwelling tube cavity, the indwelling tube cavity is inserted with the heat shrink tube to be expanded, the expansion sizing mould includes the heating section, the heating sleeve is sleeved on the expansion sizing mould, the vapor supply subassembly is provided with the vapor supply device, and the vapor supply device is provided with the vapor supply subassembly. The inner diameter of the heating sleeve is larger than the outer diameter of the expansion sizing die, a steam chamber is formed between the heating sleeve and the expansion sizing die and communicated with the heating section, and the air supply assembly is connected with the to-be-expanded heat shrink tube and used for filling compressed air into the to-be-expanded heat shrink tube. According to the heat shrink tube exp