The invention discloses a steam extraction transformation method and a steam extraction transformation structure for a flue gas baffle plate-based temperature-regulating boiler and a control method. Alow temperature reheater bypass pipeline and a low temperature reheater bypass control valve connected parallel to part of horizontal pipe stack of a low temperature reheater are arranged in a horizontal pipe stack of an original low temperature reheater and/or a newly added coal saver pipe stack connected in series or in parallel to a pipe stack of an original coal saver is added in the originalcoal saver pipe stack, and a coal saver bypass pipeline and a coal saver bypass control valve are arranged. A water supply pipeline and the newly added newly added coal saver pipe stack are connectedduring connection in series, and the water supply pipeline and the original coal saver pipe stack are connected during connection in parallel and the newly added newly added coal saver pipe stack isarranged on the coal saver bypass pipeline. By way of arranging the low temperature reheater bypass pipeline and the low temperature reheater bypass control valve part of the low temperature reheaterpipe stack and part of the coal saver pipe stack are switched as needed, so that the boiler can meet steam extraction and non-steam extraction working conditions at the same time, and therefore, the adaptability of the boiler to industrial gas and urban heat supply is improved greatly.