Portable flange processing machine: suitable for key processes of sealing flange processing in shipbuilding, petroleum and petrochemical, wind power equipment, nuclear power and other fields. The accuracy of the sealing surface directly determines the sealing performance and operational safety of the system, especially under high pressure and high temperature conditions. Processing quality is the core guarantee to prevent leakage. Covering various types of flange processing such as RTJ sealing surface processing, HUB sealing surface processing, water line sealing surface processing, convex platform, convex groove, trapezoidal groove, etc., to meet the sealing needs of different industries.