The invention discloses a venous blood collection needle with cut-off protectors, and belongs to a medical appliance. The venous blood collection needle comprises a vein piercing needle head, a negative pressure blood collection needle head and a hose tube, wherein the cut-off protectors are sleeved at the two ends of the hose tube; each cut-off protector comprises a knife rest with a central hole at the tail part; the front end of an upper sheet of the knife rest is bent downwards to form an upper blade; a semi-round edge is arranged on the lower side of the middle of the upper blade; the front end of a lower sheet of the knife rest is bent upwards to form a lower blade; a semi-round edge is arranged on the upper side of the middle of the lower blade; the semi-round edges of the upper blade and the lower blade form a round hole when in a free state, and the diameter of the round hole is greater than that of the hose tube; the hose tube is sleeved in the central hole and the round hole; the upper blade is positioned on the outer side of the lower blade; and the upper blade and the lower blade are in tight fit with each other for cutting. The venous blood collection needle can be cut after being used so as to separate the needle heads from the hose tube, is small in occupied space and is easily thrown in a relatively small and narrow wastecan, so that the probability of a puncture wound of a medical staff caused by the needle heads is greatly reduced and the environmental pollution is reduced. Therefore, the venous blood collection needle can be widely applied to clinical venous blood collection, and the structure of the venous blood collection needle can be also applied to a scalp needle.