The utility model relates to an auxiliary sharpening machine for electrode caps. A clamping and discharging mechanism comprises clamping cylinders and a discharging cylinder, wherein the two clamping cylinders are fixed on a connecting plate and used for clamping the electrode caps, the discharging cylinder is fixed on the connecting plate and used for discharging electrode caps, piston rods of the two clamping cylinders point to left and right sides of the connecting plate respectively, and each piston rod of each clamping cylinder is connected with an electrode cap mounting arm. A collecting mechanism comprises a separator and containers, wherein the separator is located below the electrode cap mounting arms and used for receiving and separating the electrode caps from metal filings, and the containers are positioned below the separator and used for containing the electrode caps and the metal filings. The auxiliary sharpening machine is simple in structure and convenient to install and maintain, the sharpened electrode caps can be separated from the metal filings, and surfaces of the sharpened electrode caps can be prevented from being polluted, so that the production efficiency is improved greatly.