The utility model discloses an oil filling port funnel of an oil filling pipe of an automobile fuel tank in the field of automobile accessories. Funnel comprising a funnel body, a cover plate for sealing the bottom of the funnel is hinged to the bottom of the funnel body; the cover plate is hinged to the funnel body through a pin shaft; a torsional spring is sleeved on the pin shaft; one end of the torsional spring abuts against the outer wall of the funnel body; the other end abuts against the bottom of the cover plate; a concave table is machined at the position, abutting against the torsional spring, of the outer wall of the funnel body. Due to the fact that the concave tables are arranged on the outer wall of the funnel body, shaking of extending components at the two ends of the torsional spring is limited, shaking of the torsional spring is limited, shaking of the cover plate is further limited, the sealing effect of the cover plate is improved, and the funnel can be used in an automobile oil filling pipe assembly.