A disposable sterile retracting blood taking needle consists of an end cover (10), a protective sleeve (11), a needle guard (12), a needle (13), a needle hub (14), a core rod (15), an outer sleeve (16), a piston (17), a sheath (18) and a blood taking needle (19). The piston (17) is arranged in a clamping groove of the core rod (15) the outer sleeve (16) is sleeved on the core rod (15) and the piston (17) the piston (17) and the outer sleeve (16) are in interference fit inner holes of the needle (13), the needle hub (14), the core rod (15) and the blood taking needle (19) are communicated the core rod (15) and the outer sleeve (16) are made of transparent materials blood backflow is judged by blood flowing in a passage in the core rod (15) and after blood taking is completed, a medical worker presses a blood taking position of the blood taking needle (19) with one hand, presses the outer sleeve (16) with a finger of the other hand and pulls the needle guard (12) to move back with other fingers of the other hand, so that a snap ring (113) of the core rod (15) enters a slot (144) of the outer sleeve (16) and is locked, and the blood taking needle (19) is hidden in a cylinder of the outer sleeve (16), and thus, the aim of safety is fulfilled.La présente invention concerne une aiguille de prise de sang rétractable, stérile et jetable, composée dun couvercle dextrémité (10), dune gaine de protection (11), dun garde-aiguille (12), dune aiguille (13), dun embout daiguille (14), dune tige dâme (15), dune chemise extérieure (16), dun piston (17), dun étui (18) et dune aiguille de prise de sang (19). Le piston (17) est disposé dans une rainure de serrage de la tige dâme (15) la chemise extérieure (16) est gainée sur la tige dâme (15) et le piston (17) le piston (17) et la chemise extérieure (16) sont ajustés par serrage des trous intérieurs de laiguille (13), lembout daiguille (14), la tige dâme (15) et laiguille de prise de sang (19) sont en communication la tige dâme (15
