The invention discloses a target plate device, and particularly relates to a target plate device applicable to a steam blowing pipe with high pressure and temperature. The target plate device used for the steam blowing pipe comprises a driving mechanism and a sealing device; the driving mechanism partially comprises a tubular frame and a target rod, wherein the upper end of the tubular frame is closed, the lower end of the tubular frame is opened, the target rod is placed in the interior hollow part of the tubular frame, and the middle part of the lateral surface of the frame is longitudinally designed with a hand wheel capable of driving the target rod to move vertically; and the upper end of the sealing device is connected with the lower end opening of the frame, the lower end of the sealing device is communicated with a pipe body of a steam pipe, and the lateral surface of the pipe body is provided with an air admission valve. The target plate device used for the steam blowing pipe has the advantages that the target plate device can effectively prevent an operator from being scalded and a mounting rod from being blocked due to airflow shock, is convenient and safe to use, and saves time and labor.