Abstract: A hydroforming mold includes a lower die holder, a lower die, a pair of upper dies, a back pressure die, an upper die holder, and a pair of axial feed push rod assemblies. The lower die is disposed in a groove base of the lower die holder. A lower mold cavity for receiving a pipe blank is provided on the lower die. The two upper dies are clamped on the lower die, and can move along the top portion of the lower die. The back pressure die is disposed between the two upper dies. The axial feed push rod assemblies are respectively sealed at an end portion of the pipe blank and the two upper dies. Each of the axial feed push rod assemblies has a runner for introducing fluid into the pipe blank, so as to axially push the two upper dies to move close to each other.