The utility model relates to a safety needle cylinder structure, which comprises a push rod, two ends of which are respectively provided with a first pushing part and a second pushing part, one side of the first pushing part is provided with at least one connecting piece, and the other end of the connecting piece is provided with a hollow pipe body.And a syringe, the interior of which is provided with a holding space, the two sides of the top surface of the syringe are respectively extended with a flange, the bottom surface of the syringe is provided with a protruding hollow fixing part, the fixing part is provided with a needle, the length of the pipe body is greater than or equal to the length of the needle, the second pushing part of the push rod is contained in the holding space, and the syringe is installed in the pipe body.一種安全針筒結構，其包括有：一推桿，其兩端分別設有一第一推動部及一第二推動部，該第一推動部的一側設有至少一連結件，該連結件的另一端上設有一中空之管體。以及一針筒，其內部具有一容置空間，該針筒的頂面兩側分別延伸出一凸緣，該針筒的底面設有一凸出的中空的固定部，該固定部提供裝設一針頭，該管體之長度係大於或等於該針頭之長度，該推桿的第二推動部係容設於該容置空間內，該針筒係裝設於該管體內。
