The utility model discloses an air -blower PLC cabinet, including display, cabinet face button, CPU, extension thermal resistance module, extension analog module, communication module, air switch, relay, terminal row, power, be divided into 5 layers in the PLC cabinet, the first layer sets gradually CPU, extension thermal resistance module, extension analog module, communication module from a left side to the right side. The utility model discloses an in the device in the PLC switch board, with concentrated settings such as PLC key components CPU in the first layer, made things convenient for the maintenance to the PLC trouble, set up signal isolator in the middle part of PLC cabinet, full play signal isolator's effect, the effectual signal interference that has reduced, whole PLC control system's stability has been promoted.