Device and method for preparing ceramic through hydrothermal process

The invention discloses a device and a method for preparing ceramic by a hydrothermal process. In the device for preparing ceramic by the hydrothermal process, an inner shell is located in an outer shell, a cavity is formed by the inner shell and the outer shell, the cavity is covered with a kettle cover, an objective table is positioned in the inner shell, a ceramic green body is placed on the objective table, the kettle cover has an inlet and an outlet, a conduit is communicated with the inlet and a pressure pump, a gas flow regulating valve is fixedly connected with the guide pipe, a safetypressure release valve is fixedly connected with the kettle cover and is communicated with the outlet, a temperature sensor and a pressure sensor are both fixed in the inner shell, a heating assemblysurrounds the periphery of the inner shell and is arranged in the cavity, and the pressure pump, the gas flow regulating valve, the safety pressure release valve, the temperature sensor, the pressuresensor and the heating ass