The invention discloses a forging die with a punch convenient to replace. The forging die comprises an upper die base and a lower die base which are matched with each other, wherein the upper die basecomprises a punch mounting seat (1) and the punch arranged on the punch mounting seat (1), and a forging groove (3) matched with the punch is formed in the lower die base; a connecting rod (2) is arranged between the punch mounting seat (1) and the punch, wherein the connecting rod (2) is internally provided with a lock rod (5), the lock rod (5) extends into the punch, and a containing groove (10) for allowing the lock rod (5) to penetrate through is formed in the punch; and stop blocks (6) are arranged on the lock rod (5) in a protruding mode, and the side wall of the containing groove (10)is provided with clamping grooves (11) matched with the stop blocks (6). The forging die has the beneficial effects that the problem that the punch is inconvenient to replace is solved, the assembly and disassembly effect of the punch is achieved through rotation of the lock rod, replacement time of the punch is greatly saved, unnecessary time is saved, and the working efficiency is improved.