The embodiment of the utility model discloses a large-scale disc saw web dividing device which comprises a machine body, a cam, a rocking bar, a pull rod shaft, a pull rod and a pusher dog, wherein the machine body is provided with a base for mounting a disc; the cam is positioned in the machine body; the edge of the cam is in contact with the edge of one end of the rocking bar; the other end of the rocking bar is fixed on the pull rod shaft; the pull rod shaft penetrates through the machine body and is fixedly connected with one end of the pull rod; the other end of the pull rod is fixedly connected with the pusher dog; the cutting blade of the pusher dog is opposite to a disc sleeve mounted on the base. According to the embodiment of the utility model, the scale division of the large-scale disc saw web dividing device is realized through the driving of the cam, so that the complex operating way in the prior art that a dividing plate is used or the scale division of a change gear is calculated is changed, and processing of a disc saw web is facilitated.