A drip irrigation head assembly comprises an outer sleeve member and a flow retarding member. The flow retarding member is passed through an entrance of the outer sleeve member to insert in and assemble to the plug connector of the outer sleeve member. The flow retarding member comprises a main body which is formed with a windingly-arranged threaded part and a spiral channel. One end of the main body of the flow retarding member adjacent to the entrance of the outer sleeve member is provided with a plurality of notches which are communicated with the spiral channel. The plug connector of the outer sleeve member can be inserted into a water pipe, so that water in the water pipe can pass through the notches to enter the spiral channel and then flow out of the outer sleeve member for a drip irrigation operation. The notches can be utilized to block impurities from entering the spiral channel and reduce channel blockage. Besides, the spiral channel can be utilized to extend the flow path, thereby slowing down the flow velocity of water. Further, the flow retarding member can be dissembled from or assembled to the outer sleeve member, so that the flow retarding member can be easily dissembled for cleanness. Accordingly, the replacement costs can be reduced and the usability can be promoted.本發明係一種滴灌頭組件,其包含一外套件及一緩流件,該緩流件係通過外套件的入口而插組於該外套件的插接頭內,該緩流件包含一本體,該本體上盤設一螺紋部,並形成一螺旋狀的流道,該本體於鄰接該入口的一端設有複數缺口,該些缺口連通該流道,該外套件的插接頭可插伸入水管中,水管中的水通過缺口進入螺旋狀的流道,進而流出該外套件而進行滴灌作業,該些缺口可阻絕雜質進入螺旋狀的流道,減少流道阻塞,以及螺旋狀的流道可延長水流路徑,進而減緩流速,且緩流件可拆組於該外套件,於流道阻塞時,可輕易地拆解清洗緩流件,並降低更換成本及提升使用便利性。10‧‧‧外套件11‧‧‧基座12‧‧‧插接頭13‧‧‧套接頭14‧‧‧鈎部15‧‧‧凸環16‧‧‧通道17‧‧‧入口18‧‧‧出口20‧‧‧緩流件21‧‧‧本體22‧‧‧螺紋部23‧‧‧流道24‧‧‧缺口
