Fuel cell cylinder valve fault detection device and detection method and fuel cell automobile

The invention relates to a fuel cell cylinder valve fault detection device which comprises an electromagnetic valve body, a cylinder valve body and a vibration sensor, the cylinder valve body is connected to the electromagnetic valve body, the vibration sensor is arranged on the cylinder valve body, the electromagnetic valve body is provided with a valve element, a valve rod, a valve seat and an upper limiting block, and the vibration sensor is in signal connection with a hydrogen storage controller; when the electromagnetic valve body is powered on, the valve element collides with the upper limiting block to generate vibration recognized by the vibration sensor, and the valve element is normally opened; and if the vibration sensor recognizes that the vibration is too small or does not recognize the vibration, the valve element is not normally opened. The fault detection device can actively detect the opening and closing states of the hydrogen bottle valve, discover risks as early as possible and give an alar