A safe blood-sampling pen, consisting of a pen head (1) and a pen body (2), characterized in that: the pen head is in pluggable connection with the pen body; the connecting end of the pen head is provided with a connection piece (21); the connecting end of the pen body is provided with an insertion groove (23) comprising a deadlock groove (30); a latch head (25) is provided at the end of the resilient arm (24) of a plunger (7), and a socket(26) is provided in the front portion of the latch head; the width of the deadlock groove is greater than the width of the latch head, and a locking shoulder (32) is provided in the front portion of the deadlock groove. The solution not only utilizes a pluggable structure between the pen head and the pen body to solve the possible safety problem during use, but also solves the reliability problem in the mechanical action of the existing safe blood-sampling pens.
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