A self-destructing syringe with automatic secure closure, comprising a hollow barrel (1), a push rod (2) sliding inside the barrel (1), a rubber stopper (3) in front of the push rod (2), a needle seat (4) in front of the barrel (1), and which is arranged such that the needle seat (4) is retracted into the barrel when the pushrod is retracted back after use, the barrel it is provided at the end of a portion (6) of increased diameter； the push rod (2) is provided with a round platform (14), characterized in that the round platform (14) is provided with an elastic ratchet (15) that extends obliquely towards the inner wall of the barrel； in the transient position between the portion (7) of normal diameter and the portion (6) of increased diameter of the barrel an oblique passage (8) is located, behind which there is a notch (9) configured to catch the ratchet (15) elastic when the pushrod is retracted backwards； and the portion (7) of increased diameter is provided inside a washer (10) which is configured to press against the back of the round platform (14)； wherein the outer diameter of the round platform (14) on the pushrod (2) is smaller or equal to the minimum internal diameter of the barrel in the oblique passage (8), but larger than the minimum internal diameter of the washer (10)Una jeringa autodestructiva de cierre seguro automático, que comprende un barril (1) hueco, una varilla (2) de empuje deslizándose dentro del barril (1), un tapón (3) de goma en frente de la varilla (2) de empuje, un asiento (4) de aguja en frente del barril (1), y que está dispuesta de tal forma que el asiento (4) de aguja es retractado dentro del barril cuando la varilla de empuje es retraída hacia atrás después del uso, el barril está provisto en el extremo de una porción (6) de diámetro incrementado； la varilla (2) de empuje está provista de una plataforma (14) redonda, caracterizada porque la plataforma (14) redonda está provista de un trinquete (15) elástico que se extiende oblicuam
