The present invention provides a semiautomatic syringe with improved safety including: a main body； a receptacle which is installed at one side of the main body, receives therein a set amount of infusion solution, and has a set pressure； an infusion solution tube which extends by a set length while penetrating the main body, connects with the receptacle, and provides a passageway for moving the infusion solution； a protective cover which is installed at the other side of the main body, connects with the infusion solution tube, extends by a set length, and has a hollow portion； an injection needle which is provided in the protective cover and has an injection hole formed to discharge the infusion solution, which moves through the infusion solution tube, to the outside； and a flow rate adjusting member which is installed in the main body and adjusts a movement amount of the infusion solution by opening and closing the passageway of the infusion solution tube, in which the injection needle is provided in a state of being inserted into the hollow portion of the protective cover, and a part of the injection needle protrudes to the outside of the protective cover by a change in pressure in the receptacle when the passageway of the infusion solution tube is opened, thereby achieving a more convenient, economic, and safe usage.
