Disposable syringe used for infection department

The utility model relates to a disposable syringe used for infection department, comprising a needle, a cylinder, a piston and a push rod, wherein the rear end of the push rod is threadedly connected with a destroyer; the front end of the destroyer is provided with a prismatic blade and the rear end thereof is provided with a needle destroying hole; and the diameter of the needle destroying hole is equal to the external diameter of the needle. the disposable syringe has the prominent advantages that the destroyer at the rear end is screwed off by the nursing personnel after injection, the needle is inserted in the needle destroying hole at the rear end of the destroyer and is broken off, and then the cylinder is destroyed by using the prismatic blade at the front end of the destroyer, the operation is convenient, the syringe is completely useless and cannot be recycled, and the cross-infection is effectively avoided.