The utility model relates to a device for monitoring stator waterway hydrogen leakage. The device comprises a stator cooling water tank connector, an overflow connector, a condensed water discharging connector and an atmosphere discharging connector. The stator cooling water tank connector is connected with a first stop valve which is connected with a parallel second stop valve and one end of a safety valve. The device is characterized in that the parallel second stop valve and the other end of the safety valve are connected with the overflow connector and a purity sensor at the same time, the purity sensor is connected in series with a flow sensor which is connected with the atmosphere discharging connector and a third stop valve at the same time, and the third stop valve is connected with the condensed water discharging connector. The device has the advantages of being quick, visual, accurate and high in reliability, stator waterway leakage gas flow can be monitored, meanwhile, gas components and purity can be analyzed and judged, operation personnel can be guided to carry out right operation, and the device can be promoted and used in an electricity generator with hydrogen as cooling media.