Automatic bolt fastening device using two-arm scara robot

Disclosed is an automatic bolt fastening device which includes a main body frame, a lower arm installed in the main body frame to be rotatable in a rightward-leftward direction, a gripper installed in a tip portion of the lower arm to pick up the bolt from a bolt feeder, an upper arm installed in the main body frame on an upper side of the lower arm to be rotatable in the rightward-leftward direction, and a bolt fastener installed in a tip portion of the upper arm to be movable upward and downward, and fastening the bolt to the workpiece located on the assembly line after being moved to the assembly line by the upper arm in a state where the bolt fastener vacuum-suctions the bolt picked up by the gripper.