Disclosed is a self-destructing syringe with a high level of safety and convenient assembly, comprising an outer casing (1), a core bar (2), a piston (3), a conical head component (8), a syringe needle (9) and a protecting jacket (10). The syringe needle (9) is installed and fixed in the conical head component (8), and the conical head component (8) consists of a threaded conical head (4), a sealing ring (5), a transition part (6) and a hollow wedge (7). The protecting jacket (10) is put around the syringe needle (9) and is movably connected to the needle base of the syringe needle (9) the conical head component (8) is installed and fixed in the inner cavity at the front end of the outer casing (1) the piston (3) is installed on the core bar (2) the main part of the core bar (2) is sheathed inside the outer casing (1) and the front end of the core bar (2) is inserted into the conical head component (8) while the syringe is injecting and is able to make the syringe needle (9) installed on the conical head component (8)return inside the outer casing (1). The syringe has a simple structure, needs low accuracy when it is moulded, is convenient to process and thus is more suitable for automated assembly and is convenient for production in large volumes with stable quality control and for meeting the volume requirements of the marketplace, while at the same time the risk of ineffective safety self-destructing syringes caused by careless assembly or careless use and operation thereof is avoided.Linvention concerne une seringue non réutilisable ayant un haut niveau de sécurité et un assemblage pratique, comprenant une enveloppe externe (1), une barre centrale (2), un piston (3), un composant tête conique (8), une aiguille de seringue (9) et une chemise de protection (10). Laiguille de seringue (9) est disposée et fixée dans le composant tête conique (8), et le composant tête conique (8) consiste en une tête conique filetée (4), une bague détanchéité (5), une partie de trans
