The invention relates to a valve, in particular to a self-cleaning valve. According to the self-cleaning valve, impurities in water can be removed, and the subsequent use of the water is not affected;and the self-cleaning valve facilitates removal of the impurities. According to the technical scheme, the self-cleaning valve comprises a valve body, connecting nuts, a connecting seat, a first screwrod, a first fastening nut, a buffer cushion, a first connecting block, an elastic filter film, an activated carbon plate, a second fastening nut and the like; the right and left sides of the valve body are each provided with the corresponding connecting nut, and the top of the valve body is provided with the connecting seat; and the right and left parts of the top of the valve body and the rightand left parts of the connecting seat are each provided with a first threaded hole. According to the self-cleaning valve, the water is discharged into the valve body, and the activated carbon plate is in contact with the water for sucking the impurities; a rotating handle is turned to rotate counterclockwise, and a valve core can be separated from the buffer cushion, so that the water with the impurities removed flows into the right side of the valve body and is discharged into a right side water pipe; in this way, the situation that the water containing lots of impurities is discharged for people to use can be avoided; and the subsequent use of the water is not affected.