Fuente: WIPO "apiculture" The invention relates to a pressure control device and method, a solid fuel cell system and a control device. The pressure control device comprises control equipment, a buffer container and pressure adjusting equipment, the control equipment is used for acquiring pressure fluctuation information and temperature information of a working medium in the solid fuel cell system and determining a control mode of the pressure control device according to the pressure fluctuation information and the temperature information; and the pressure adjusting equipment is used for controlling the pressure of the working medium flowing through the buffer container in the solid fuel cell system based on the control mode under the control of the control equipment. In the embodiment of the invention, due to the addition of the buffer container in the solid fuel cell system, when the pressure of the working medium in the solid fuel cell system fluctuates, the inherent space provided by the buffer container can provide a certain amount of buffer capacity, so that the pressure fluctuation is buffered. And the pressure of the working medium flowing through the buffer container can be controlled by controlling the pressure adjusting equipment, so that a pressure fluctuation inhibiting effect is achieved.