The invention discloses a line connection device used for product bonding. The device comprises a bonding machine, a tray transmission line body is arranged on the bonding machine, an automatic tray loading device is arranged at the left end of the bonding machine and is connected with the tray transmission line body, the right end of the bonding machine is provided with an automatic tray discharging device, and the automatic tray discharging device is connected with the tray automatic line body. The line connecting device used for product bonding can automatically finish loading and discharging of bonding products, the automation process replaces manual work, efficiency is greatly improved, and the device is simple in structure, low in cost and high in cost performance.