Abstract: A safety syringe has a hollow barrel, a plug, a cord, a needle hub and a plunger. The hollow barrel has a distal open end, a proximal open end, a distal annular rib defined inside the proximal open end, a central annular rib defined inside the hollow barrel. The plug is detachably mounted inside the proximal open end of the hollow barrel. The needle hub is mounted in the plug. The plunger has a push rod and a seal mounted on the push rod and is received inside the hollow barrel. The cord connects to the plug and the seal. When using the safety syringe, the plunger pulls the cord connected to the plug, so the needle hub is pulled inside the hollow barrel to keep people from being hurt by an exposed needle.