The invention relates to technology for preparing a high-performance graphite sealing material, in particular to a device for preparing a graphite metal clad for hot isostatic pressing. The device is provided with a graphite column, a metal bar, a graphite gasket, a metal gasket, a graphite crucible cover, a graphite crucible and a pouring gate, wherein the graphite column is arranged in the graphite crucible; the lower surface of the graphite column is contacted with the bottom of the graphite crucible through the metal gasket; gaps for filling metal are reserved on the upper surface and lateral sides of the graphite column; the metal bar is inserted between the upper surface of the graphite column and the graphite crucible cover arranged on the top of the graphite crucible; the graphite gasket is arranged on the upper surface of the graphite column; the upper surface of the graphite gasket is provided with the metal bar; and the graphite crucible cover is provided with the pouring gate. In the device, the metal graphite to be steeped is placed in the center of the bottom of the graphite crucible by axial fixation and radial fixation methods, so as to reduce immersion allowance of metal silver and manufacturing cost.