A safe and convenient disposable blood-taking needle with a double-surface cap comprises a needle body (1) with a needle tip (4), a needle handle (2) and a needle cap (3). The needle body (1) is fixed inside the needle handle (2). The needle tip (4) extends from a first end of the needle handle (2) and is inserted in the needle cap (3). A main body of the needle cap (3) is a block body. A first surface (5) and a second surface (6) are arranged on the block body. Both the first surface (5) and the second surface (6) are planes, wherein one is upward, the other is downward, and an included angle between the first surface and the second surface in space is smaller than 45 degrees. A first blind hole (7) is arranged on the first surface (5), a second blind hole (8) is arranged on the second surface (6), and both the first blind hole (7) and the second blind hole (8) are matched with the first end of the needle handle (2) in an insertion relationship. On the block body, other surfaces except the first surface (5) and the second surface (6) are convex-outward arc surfaces or/and convex-outward edge surfaces. The blood-taking needle is particularly suitable for family personal care, can effectively avoid a risk that a hand is punctured by the blood-taking needle again in a process of the needle tip (4) being inserted into the needle cap (3) after use, and is safe and convenient to use.L'invention concerne une aiguille de prélèvement de sang jetable, sûre et commode ayant un capuchon à deux surfaces, qui comprend un corps d'aiguille (1) ayant une pointe d'aiguille (4), un manche d'aiguille (2) et un capuchon d'aiguille (3). Le corps d'aiguille (1) est fixé à l'intérieur du manche d'aiguille (2). La pointe d'aiguille (4) s'étend à partir d'une première extrémité du manche d'aiguille (2) et est introduite dans le capuchon d'aiguille (3). Un corps principal du capuchon d'aiguille (3) est un corps de bloc. Une première surface (5) et une seconde surface (6) sont disposées sur l
