The present invention relates to a water-saving water tank which does not leak and can utilize water according to needs. Said water-saving water tank can be mainly used for sanitary equipment, and is formed from the following several portions: external water tank, internal water tank, driving mechanism, water tank cover and basin, ceramic core valve, water inlet valve, water outlet and silent deflector, etc. Said invention also provides the concrete structure of above-mentioned every portion and concrete connection mode of all the above-mentioned portions. |