Automatic abrasive paper tearing device

The invention relates to the field of dry grinding, in particular to an automatic abrasive paper tearing device applied to abrasive paper on a grinding device. The automatic abrasive paper tearing device is characterized by specifically comprising an abrasive paper backup plate, a first air cylinder, a positioning block, a second air cylinder, a bracket and a control module, wherein the abrasive paper backup plate is arranged on a base plate and extends out of the base plate, the first air cylinder is arranged on the upper part of the abrasive paper backup plate, the positioning block is matched with a grinding disc in shape and connected with the first air cylinder, the second air cylinder is arranged on the upper part of one side of the abrasive paper backup plate, the bracket is correspondingly connected with the second air cylinder, and the control module is connected with the grinding device, the first air cylinder and the second air cylinder; and when the abrasive paper needs tobe replaced, the control