The invention relates to a swinging high-temperature ash slag control valve used for controlling slag amount when the slag is fed and discharged by a slag cooler of a cycle fluid-bed boiler, adjusting and controlling the diversion of cycle ash amount of an external heat interchanger, and controlling the discharging of slag in other sites. The control valve comprises a shell 2; one side of the shell 2 is provided with a slag/ash inlet 1, the bottom of the shell 2 is provided with a slag/ash outlet 10, the inner side of the slag/ash inlet 1 is provided with a valve head 3, and the valve head 3 is connected with a transmission mechanism 5 by a valve stem 4; and the transmission mechanism 5 is controlled by a controller 6 to drive the valve head 3 and the valve stem 4 to rotate so as to control the slag/ash discharging amount. The control valve is favorable for realizing sealing, reduces the possibility of ash slag leakage, and has the characteristics of reliable operation, blocking proofing, and simple and convenient assembly, operation and maintenance.