The invention relates to a self-adjusting flow control nozzle for pyrolysis of desulfurized waste liquid. The self-adjusting flow control nozzle is composed of a control adjusting mechanism fixedly connected on a nozzle fixed head of a nozzle main body structure, and is mounted on a rising pipe of a coke oven; the nozzle main body structure is located on a cylindrical body structure located at the lower end of the control adjusting mechanism and made of a high-temperature-resistant material; the other end of the cylindrical body is provided with the nozzle fixed head connected to the control adjusting mechanism; the control adjusting mechanism is located on the upper end face of the nozzle main body structure, and is composed of a valve body capable of enabling a rotation screw, an adjusting lever and an adjusting head to be correspondingly sealed with the nozzle located at the end of the cylindrical body structure and capable of controlling the size of the opening degree, and a signal receiving processor and a signal transmission device which are arranged at both sides of the valve body. Since the nozzle is made of a high-strength wear-resistant and high-temperature-resistant material and has a self-adjusting flow, especially, by virtue of the waste heat from high-temperature raw coke oven gas, the desulfurized waste liquid produced in a desulfurization process is subjected to catalytic or non-catalytic pyrolysis processing, the waste heat from raw coke oven gas is utilized and the secondary salt of the desulfurized waste liquid is pyrolyzed, and thus the purpose that wastes are treated with processing of wastes is achieved.