A dropping head for a wash basin or a bath basin includes a base which is installed with an upper and a lower filter disk which are detachable for cleaning or updating. Cleaning grains can be placed between the upper filter disk and the lower filter disk. Cleaning material in the cleaning grains is released with draining water so as to have the function of odor-proof and cleanness of the pipes. A periphery of the outer threads of the base is sequentially engaged with an upper, a lower and a hard plastic washer and a first nut for locking the base to a water drain hole of a basin. A rubber washer installed between the two second nuts and they further encircles a periphery of the base for adjusting the outer diameter of the base to tightly resist against an inner wall of a tube connect thereto.
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