The utility model relates to a safety pin set, which comprises a connecting seat with a plug hole and two wings.A fixed pin ring with a needle head and a connecting pipe part, the connecting pipe part is fixedly connected with the end of the liquid medicine catheter through the plug hole of the connecting seat.A set of clamp lower seats are arranged under the fixed needle ring, the connecting seat and the liquid medicine catheter connection.A corresponding clamp lower seat 3 groups of clamp upper seats are arranged above the fixed needle ring, the connecting seat and the liquid medicine catheter connection.A set of movable sheath which is set outside the retaining ring and is clamped between the upper clamp seat and the lower clamp seat.By pushing the sheath outwards, the used needle will be blocked from the outside, so as to prevent the related personnel who will contact the needle group later from being injured by the needle and infected with the disease； in addition, the sheath will push outwards after the injection of the needle and the positioning is true, the sheath will not be retracted again, which can prevent the used needle from being used twice.一種安全針組，包括：一具有插接孔及二翼片之銜接座。一具有針頭及接管部之固針環，該接管部穿貫銜接座之插接孔與藥液導管之端部套固連結。一組設於固針環、銜接座及藥液導管連結處下方之夾掣下座。一對應夾掣下座3組設於固針環、銜接座及藥液導管連結處上方之夾掣上座。一套組於固針環外部並夾設於夾掣上座及夾掣下座中間之可移動護套。藉由護套向外推移將使用過之針頭與外界產生阻隔，進而防止後續再接觸該針組之相關人員遭到針頭刺傷而感染疾病；另外，護套在針頭注射使用後即向外推移並且定位確實，該護套再無縮回之可能性，可杜絕使用過之針頭遭人二次使用。
