The invention discloses a flexible brush head, and belongs to the field of cleaning tools. The flexible brush head comprises a brush, a swing arm, a drive motor, an installing support, a positioning shaft and an elastic return mechanism. The swing arm is transversely arranged, the drive motor is arranged at one end of the swing arm, and the brush is arranged on a rotation shaft of the drive motor.The positioning shaft is vertically arranged on the installing support, the other end of the swing arm is provided with a through hole matched with the positioning shaft, and the swing arm is in cupjoint to the positioning shaft through the through hole and can rotate around the positioning shaft. The swing arm is connected with the installing support through the elastic return mechanism. The swing arm is connected with the installing support through the elastic return mechanism, after the swing arm rotates, the swing arm tends to return to the original position under the action of the elastic return mechanism, and certain pressing force can be provided for the brush. Meanwhile, the brush can return to the original work position after bypassing a protruding point, the brush head has certain flexibility, the brush can constantly run attached to the uneven surface needing to be cleaned or wiped, and the problem of jamming or collisions is solved.