The invention discloses an O-shaped sealing ring packing bonding method and a special tool. Bonding is conducted through an upper fixed pressure block, a lower fixed pressure block, an upper pressing block and a lower pressing block; and O-shaped sealing packing to be bonded is put into first packing grooves formed in the lower fixed pressure block, and O-shaped sealing packing heads are put into third packing grooves formed in the lower pressing block and fixedly connected with the upper fixed pressure block and the lower fixed pressure block. The two O-shaped sealing ring packing heads are aligned and smeared with glue. Fourth packing grooves formed in the upper pressing block are pressed on the third packing grooves in the lower pressing block to clamp the portions to be bonded. The special tool comprises a base (1). The lower fixed pressure block (2) is arranged above the base (1). The lower pressing block (3) is arranged in the middle of the lower fixed pressure block (2). The upper fixed pressure block (4) is arranged above the lower fixed pressure block (2). The upper pressing block (5) is arranged above the lower pressing block (3). The special tool is good in bonding effect, long in service life, short in bonding time, easy to operate and the like.