The invention discloses a method for molding connection structure for automobile oil pipe. The connection structure comprises a steel pipe, a rubber pipe, and an metal sleeve. Two annular block rings and two annular bumps are formed on the terminal of the steel pipes, the rubber pipe are nested on the annular projection section, the metal sleeve is nested outside the rubber pipe of the annular projection section, which is directly fixed on the first head connecting block ring by the second block ring extrusion molded. A contraction portion is disposed on the metal sleeve on both sides of the annular projection corresponding to the steel pipe, and two O-type ring sealing are added between the steel sleeve and the first head connecting block ring adhering the first bump. According to the invention, sealing points is added to the connection structure, stability is greatly enhanced, thus making the connection structure suitable for higher pressure and stronger temperature pulse cycling ability.