Flange sealing surface leakage purge device belongs to the field of pressure vessel use and maintenance, to eliminate the fire and explosion risk caused by medium leakage of pressure vessel flange inservice. The steam distribution pipe assembly (2) is composed of a steam distribution pipe assembly (2) and a distribution pipe support assembly (2) and a movable clamp (2). The steam distribution pipe assembly (2) is composed of a coil pipe (2), a connecting flange (9), a tee pipe (9) and an intake pipe (9). Usage: divide the hoop (_) in the distributor support assembly (_) into two lobes and clamp it on the flange disc of the lower flange (_); connect the two lobes of the coil (_) tightly by connecting the flange (_) with bolts; the sweeping hole on the coil (_) must be in the middle part ofthe gap between the middle flange (_) and the flange (_); connect the inlet pipe (_) with the external steam, and blow the steam through the upper part of the coil ( The sweeping hole blows away theleakage medium between flanges. The utility model is applicable to the treatment and protection of flange medium leakage under various specifications, and has the advantages of simple operation, safety and reliability.