Steam pocket wall temperature difference control device of gas-steam combined cycle unit

The utility model relates to a steam drum wall temperature difference control device of a gas-steam combined cycle unit. A steam drum is arranged above a waste heat boiler, and the steam drum is connected with the waste heat boiler through a descending pipe, an ascending pipe and a reheating pipe; a stop lever is further arranged in the steam pocket to block the downcomer, the stop lever can move along the axis of the downcomer, a temperature control spring is arranged between the stop lever and the connecting end of the downcomer, and the two ends of the temperature control spring are fixedly connected with the stop lever and the connecting end of the downcomer respectively; and when the temperature rises, the temperature control spring extends and drives the stop lever to move to remove the blocking of the downcomer. The stop lever is arranged at the connecting position of the downcomer in the steam pocket and controlled by the temperature control spring, when the steam pocket is filled with hot water, name