This invention relates to an safety intravenous (I.V.) catheter with auto lock and in particular, a safety intravenous (I.V.) catheter device where the invention consists of a slider fitted on the hollow cylinder which is round in shape and front portion of the cylinder has a mounting with a mouth and opening for needle ejection and bottom portion of the cylinder is again a hollow with provisions of fitment of a specialized lock at the rear end and the slider from distal end to proximal end brings the needle back into the cylinder.
