Grinding machine extension tool

The invention belongs to the technical field of grinding, and discloses a grinding machine extension tool. The grinding machine extension tool comprises an extension rod, an air pipe and a valve, wherein an air inlet channel is formed in the extension rod, one end of the extension rod is used for installing a grinding machine, and the air inlet channel is communicated with the grinding machine; the air pipe is arranged at the other end of the extension rod, and the air pipe is communicated with the air inlet channel; and the valve is mounted on the air pipe or the extension rod so as to control the air pipe or the air inlet channel to be opened and closed. The extension rod is arranged to be connected with the grinding machine, an operator can operate the grinding machine to conduct grinding by directly holding the extension rod with hands, then the operator can stand for operation, the grinding operation efficiency can be effectively improved, the operator is far away from the grinding position, the operator