The invention discloses an automatic scale-cleaning shower head, which comprises a shell body, wherein a water inlet is arranged on the shell body, and a water chamber is arranged in the shell body. The water inlet is communicated with the water chamber, and a guide post is fixedly installed in the water chamber. The guide post is fixedly connected with the shell body, and a sliding sleeve is movably installed at the periphery of the guide post.. The periphery of the sliding sleeve is provided with a moving plate, and the periphery of the moving plate is matched with the shell body. A plurality of water outlets are arranged on the moving plate, and a plurality of descaling needles are fixedly installed in the shell body, correspond to the water outlets, and are matched and sealed with the water outlets one to one. A limiting piece is installed on the shell body or the guide post, and the limiting piece is used for limiting the moving-down limiting position of the sliding sleeve or the moving plate. As the automatic scale-cleaning shower head is provided with the descaling needles and the sliding sleeve which can move up and down, the sliding sleeve can do a reciprocating motion up and down, so that the water outlets and the descaling needles mutually rub, scales adhered to the inner surfaces of the water outlets are thoroughly removed, and the normal water spraying of a water injection nozzle is ensured. Therefore, the service life of the shower head can be prolonged, the descaling difficulty is reduced, and the descaling efficiency is increased. The shower head can realize descaling through switching of a water valve.