The invention relates to a bending die, in particular to a pre-forging and deep bending die which comprises an upper die plate and a lower die plate and further comprises a bottom guide plate, a disccolumn, a forming pressure block, a locating block, a workpiece, a left half die body and a right half die. The bottom guide plate is fixed to the upper die plate. The disc column is located on one side of the guide plate. The forming pressure block is fixed to one side of the guide plate. The locating block is fixed to the guide plate and located below the forming pressure block. The workpiece islocated between the forming pressure block and the locating block. The left half die body is hinged to one side of the lower die plate. A left forming cavity is formed in one side of the left half die body. A left guide groove is formed in the bottom of the left forming cavity. The right half die body is hinged to the other side of the lower die plate. The left half die body and the right half die body are arranged oppositely. A right forming cavity is formed in one side of the right half die body. A right guide groove is formed in the bottom of the right forming cavity. The right guide groove is located in one side of the right half die body. The left guide groove and the right guide groove are used for containing the locating block. The left forming cavity and the right forming cavity form an external shape of the workpiece. The die is simple in structure, stable, reliable, high in bending efficiency and long in service life, and does not get stuck easily, and damage to the workpiece and the die is avoided.