The invention relates to the technical field of flange plates, in particular to an improved high-sealing lubricating flange. According to the adopted technical scheme, the improved high-sealing lubricating flange comprises a cylindrical main body flange connecting column and is characterized in that the lower end of the main body flange connecting column is provided with an integrally-formed tapered clamping assembly connecting column, and the lower end of the clamping assembly connecting column is provided with an integrally-formed cylindrical assembly connecting positioning column; the upperend of the main body flange connecting column is provided with an integrally-formed tapered top assembly connecting column, and the diameter of an outer cylinder of the main body flange connecting column is the same as the diameter of the lower end of the top assembly connecting column; and a horizontal face is arranged in the center of the upper end of the top assembly connecting column, and a cylindrical center assembly connecting hole penetrating through a whole part is formed in the center of the horizontal face. The improved high-sealing lubricating flange has the advantages that throughdual-position clamping sealing, the overall connecting tightness is guaranteed, through two tapered structures, parts can be more convenient to assembly, and the using safe stability is more reliable.