This invention relates to a concentricity-adjustable mould, which comprises a fixed template, a movable template, a core and an adjusting lever. The fixed template and movable template are set face toface; the core penetrates the fixed template and its end face is at the same level with the movable template. An indicator is set on the end face of the core and a calibrator is set on the end face ofthe movable template adjacent to the core surroundings. The adjusting lever can separately connect and rotate the core so as to make the indicator and the calibrator aligned with each other. Adopting the structure above, the mould can be greatly simplified and concentricity can be adjusted accurately and reliably.