The invention relates to a terminal pin insertion mechanism of a double-framework coil. A rack is provided with a conveying device, the conveying device is provided with a carrier, two position-clamping columns are arranged on the carrier side by side, the rack is sequentially provided with a pin insertion device matched with the carrier, a terminal pin leveling device, a detecting device and a framework clamping manipulator, the pin insertion device comprises a pin insertion base arranged on the rack, the pin insertion base is provided with two terminal pin conveying grooves, the tail ends of the terminal pin conveying grooves are provided with terminal pin material receiving devices, the terminal pin material receiving devices are matched with the upper and lower frameworks of the carrier through terminal pin material jacking devices, the pin insertion base is provided with a pin-insertion material pressing air cylinder, and the lower portion of the pin-insertion material pressing air cylinder is connected with pin-insertion material pressing block matched with a product on the carrier. According to the terminal pin insertion mechanism of the double-framework coil, through the cooperation between the carrier with the two position-clamping columns and the conveying device, the two frameworks are synchronously conveyed; through the cooperation of the pin insertion device with the two terminal pin conveying grooves, the synchronous pin insertion of the upper and lower frameworks can be achieved, the pin insertion efficiency is improved, and the good insertion effect can be achieved.