The present invention discloses a needle device, comprising a needle base and a needle head being placed in the needle base, a first sleeve part slides on the needle base, a second sleeve part slides on the first sleeve part; at least one protrusion portion is arranged on upper surface of the needle base, a through hole is arranged at a rear end of the first sleeve part, at least one elastic limit portion is arranged in the through hole, the elastic limit portion prevents the protrusion portion from moving toward fixed end of the elastic limit portion when the protrusion portion moves to position between inner wall of the through hole and free end of the elastic limit portion; a limit apparatus is also arranged between the first sleeve part and the second sleeve part. After use of the needle device of the present invention, the needle head can be covered quickly by the sleeve part on the needle base, and the connection between the sleeve part and needle base is tight, the sleeve part will not rebound, security of products is improved effectively.