The utility model relates to an inner filter net for a water tap. A filter net is sheathed on a sealing ring, arranged between a tap box and a water inlet of a water pipe. The sealing ring is provided with a ring groove for sheathing the filter net. The upper part of the filter net is provided with a ring edge extending outward. The lower part of the filter net is provided with semi-sphere with a smooth surface which is provided with a plurality of filter openings, and the filter openings are taper holes with larger inner parts and smaller outer parts. When the utility model is combined, the semi-sphere below the filter net is convexly extended to the lower part of the water inlet just through the water inlet of the water pipe, preventing a ceramic disc from being damaged by sundries and preventing a water flowing through hole from being clogged. The sundries is not easy to attach to the surface of the filter net and is not easy to insert and clamp on the filter openings, even if the sundries is attached to the filter net occasionally, the utility model is easy to clean.