The invention discloses an automatic tab-bending device for a battery side plate, which is characterized in that it mainly includes an L-shaped mounting seat, a lifting cylinder, a cylinder pad, a T-shaped support plate, a cylinder, a fixing seat, a connecting rod, a sleeve clip, and a screw , upper plate, lower plate, side plate, through hole, sliding cylinder, mounting plate, slider, guide rail, B mounting plate, air finger, pressure plate, bump, waist hole, shaft rod, swing top piece, the L The spacer is installed horizontally on the mounting base, the lifting cylinder is installed on the spacer, the T-shaped support plate is installed on the side of the L-shaped mounting seat, and the upper and lower plates, the cylinder, and the shaft are arranged successively above the T-shaped support plate. A mounting plate is installed behind the upper and lower plates, and guide rails and air fingers are arranged on the mounting plate. The pole group is arranged in the middle of the lifting cylinder and the pressing plate. The strength and angle of the tabs are consistent, ensuring that the side plates of each pole group are not damaged, which improves the quality and production efficiency of battery products.