Pipe joint expansion forming die

The utility model discloses a pipe connector expansion forming die, and relates to the technical field of die manufacturing. The pipe connector expansion forming die comprises a plunger chip provided with a squeezing part, an upper clamp die arranged in an upper clamp die base and a lower clamp die arranged in the lower clamp die. When the upper clamp die and the lower clamp die are in a die assembly state, a cavity between the upper clamp die and the lower clamp die is set to be a squeezing cavity. The expanded formed end of a pipe body is installed in a pipe joint in a penetrating mode and placed in the squeezing cavity, and the end of the pipe body is connected with the pipe joint in an expansion mode through the plunger chip punching in the end of the pipe body. In comparison with the prior art, the expanded end, installed in the pipe joint in the penetrating mode, of the pipe body is connected with the pipe joint in an expansion mode to form a pipe fitting connecting assembly, and the problems that an existing welded pipe fitting connecting assembly is low in quality rate and production efficiency can be solved.