The invention provides a transforming and operating method for reducing the extraction steam parameter of a steam turbine coordinated by steam compressor industry steam supply branched network pipeline pressurization. The system configuration comprises an industrial steam header, branched control valves for each heat user, a steam compressor, a gearbox high-speed shaft, a gearbox low-speed shaft, a drive frequency conversion motor, a control module, a power plant DCS and valves and pipe fittings connecting the above devices. By addition of steam compressor on an industry steam supply pipe network high-pressure branched network pipeline, the control module is coordinated with the steam turbine to adjust the load, the industrial steam supply overall extraction steam parameter is reduced, and the purposes of energy saving and turbine load adjustment are achieved. According to the transforming and operating method for reducing the extraction steam parameter of the steam turbine coordinated by steam compressor industry steam supply branched network pipeline pressurization, a new technical route is provided for multi-parameter and multi-user industrial steam supply, combined heat and power generation thermal generator set conducting deep pitching peak is also provided for a novel technological idea, and meanwhile, the transforming and operating method can also be applied to long-distance steam supply pressurization. The transforming and operating method has the characteristics of being simple in transformation and large in energy saving volume.