A safety blood lancet device includes an outer sleeve. A fixing tube fixed in the outer sleeve has a cantilever hook. A carrier is elastically inserted into the fixing tube, and in which a lancet is separably installed at a front end thereof, a rear tip which is at a rear end of the outer sleeve and connected with a rear end of the carrier so as to load the carrier by pulling the carrier toward a rear side. A female nut is separably coupled to the outer sleeve. A front tip is rotatably installed at a front end of the female nut and in which a needle of the lancet protrudes through a front end thereof when the carrier is shot. A rear end of the fixing tube is selectively inserted into a safety cap and is elastically installed toward a front side of the outer sleeve.
