Combined heat and power supply double-extraction steam turbine

The invention provides a combined heat and power supply double-extraction steam turbine. The combined heat and power double-extraction steam turbine comprises a high-pressure cylinder, a first intermediate-pressure cylinder, a second intermediate-pressure cylinder and a low-pressure cylinder which are sequentially distributed from high to low of steam inflow parameters; a steam exhaust port of the first intermediate-pressure cylinder is connected with a first intermediate-pressure steam exhaust mother pipe; the end portion of the first intermediate-pressure steam exhaust mother pipe is connected with a first adjusting steam extracting pipeline and a second intermediate-pressure steam inflow mother pipe; the end portion of the second intermediate-pressure steam inflow mother pipe is further connected with a first intermediate-pressure steam inflow branch pipe connected with a steam inlet of the second intermediate-pressure cylinder; a steam exhaust port of the second intermediate-pressure cylinder is connected