The invention discloses a radome bonding tool. The radome bonding tool is characterized in that a bonding platform is installed on a base, a positioning piece is arranged on the working face of the bonding platform so as to position a metal ring, a lifting device is arranged below the bonding platform, the lifting device comprises jacking columns, the jacking columns are upwards lifted to penetrate through the bonding platform and support a radome placed over the metal ring, and a fastening device is installed on the bonding platform, is located around the radome and abuts against the radome.Meanwhile, the invention discloses a method for bonding the radome by using the bonding tool. Bonding is carried out through forward mounting of the radome, the bonding effect between the radome and the metal ring is excellent, the situation that an adhesive flows to the inner wall surface of the radome is avoided for a formed product, and the cost control optimization caused by the use of the adhesive is reduced; the bonding process shortens the curing period and is beneficial to mass production; and by using the bonding tool, manual contact with the radome is reduced, the human risk is reduced, the labor cost is reduced, and the mechanization level is improved.