A structure of the syringe cover including the barrel is a design that the aperture end of the hollow barrel of a safety syringe is coupled to a syringe cover. While the plunger is pulled back, the needle of the safety syringe disengages from the plunger, and the needle and the needle holder integral are received within the hollow barrel. With the syringe cover coupled to the aperture end of the hollow barrel, the medical personnel are prevented from being pricked with needles because of exposure of needles retained within the hollow barrels by mutual jostle between syringes in medical wastes.