The invention relates to a polymer polar ear welding method, which comprises that: a, cutting the length of polar ear; b, putting cathode polar ear at the middle of copper foil, aligning the sealing film and upper edge of baffle film; c, moving to ultrasonic welding machine, pressing down battery, making upper face of battery horizontal with welding base, and welding; d, putting anode polar ear at middle of copper foil relative to electric corn, aligning the sealing film and the upper edge of baffle film; e, moving to ultrasonic welding machine, pressing down the battery, making upper face of battery horizontal with welding base, welding; f, cutting off abundant copper and aluminum foils; g, bending welding area toward to side of battery for 90degree, keeping two polar ears parallel. The invention can reduce processes and improve welding speed.