Automatic spot welding machine

The present invention relates to a spot welding machine for automatically spot welded to the vehicle panel, the roller having a roller which is rotated in accordance with the panel part to be welded unit; And a rotation detector for detecting the rotation of the roller; And a controller for calculating a moving distance by a predetermined operation in accordance with the signal from the rotation detection unit, outputs the operation signal to the spot welding gun every time a movement by a predetermined distance and spot welding; A spot welding gun that is moved with the rotation of the roller is supported on a frame together with the roller unit, activated by an activating signal of the controller; Including by, an effect that is manually there is no need to spot welding intervals to mark the spot-welding position uniform as in the prior art.