The invention relates to a novel water tank water level and water replenishing electromagnetic valve remote monitoring system and monitoring method. The system includes a main device, an in-situ device, an electromagnetic valve and a water level gauge; the main device is in wireless communication with the in-situ device; the in-situ device is connected with the electromagnetic valve and the water level gauge respectively; the electromagnetic valve is installed on a water entering pipeline at the water inlet of a water tank; and the water level gauge is arranged on the water tank. Compared with the prior art, the novel water tank water level and water replenishing electromagnetic valve remote monitoring system and monitoring method of the invention have the advantages of remote monitoring, powerful functions and the like.