A fuel cell having micro sensors is disclosed. It has a pair of bipolar plates and a catalytic portion. About each bipolar plate, it has an inner surface and an outer surface. There are a fluid inlet, a fluid outlet, a channel, one or more micro sensors and several signal lines disposed on this inner surface. This catalytic portion is disposed between two bipolar plates. So, it can detect the actual internal conditions in the fuel cell. There is no need to install extra micro sensors. And, the fuel cell stability and safety can be enhanced significantly.