The invention relates to the technical field of medical treatment, and discloses an intelligent water replenishing device for fully separating out effective components in traditional Chinese medicine decoction. The intelligent water replenishing device comprises a shell, the interior of the shell is movably connected with a sensing water replenishing mechanism, the sensing water replenishing mechanism comprises a heat insulation tank, a filter screen for isolating traditional Chinese medicine and water, a trigger assembly for detecting the reduction of the water amount of the heat insulation tank and an adding assembly for water replenishing of the heat insulation tank, wherein the heat insulation tank is fixedly connected to the interior of the shell, the filter screen is fixedly connected to the interior of the heat insulation tank, the triggering assembly is movably connected to the interior of the heat insulation tank, the adding assembly is movably connected to the inner side of the heat insulation tank, and the water amount in the heat insulation tank can be accurately measured through the triggering assembly, meanwhile, water is timely and efficiently added into the heat insulation tank through the adding assembly, then automatic sensing of the water amount in the traditional Chinese medicine decocting process is achieved, meanwhile, water is automatically replenished, the workload of traditional Chinese medicine decocting of a user is effectively reduced, meanwhile, the traditional Chinese medicine decocting efficiency and effect are improved, and the traditional Chinese medicine decocting success rate is increased.