Pre-filled syringe protective cap with excellent sealing performance

The utility model discloses a prefilled syringe protective cap with excellent sealing performance, which comprises a protective cap body, an annular clamping groove is arranged at the middle upper part of the protective cap body, a cavity matched with a syringe conical head of a prefilled syringe is arranged at the lower part of the protective cap body, a cylindrical bulge is arranged at the bottom of the cavity, and a cylindrical plug is arranged at the lower part of the cylindrical bulge. The structure of the protective cap of the pre-filled syringe is improved and adjusted according to the centrifugal experiment of the pre-filled syringe, so that the protective cap of the pre-filled syringe has better sealing performance. The sealing performance is ensured through the thickness setting of the annular clamping groove, the radian setting of the conical cavity and the lead angle, the setting of the position and the diameter of the cylindrical protrusion and the structural design and the size adjustment in the