Combined sealing element used for thread of hydraulic transmission pipe

The invention discloses a combined sealing element used for a thread of a hydraulic transmission pipe. The combined sealing element comprises a metal piece, an inner sealing element body, an outer sealing element body, a thread accommodating groove, a limiting top edge, inner limit grooves, limit rings, outer positioning rings, a top edge groove, a lower limit groove and an extended sealing sleeve. By adoption of the combined sealing element used for the thread of the hydraulic transmission pipe, the airtightness of the thread of the hydraulic transmission pipe can be improved, the structure is reasonable, installation is convenient, no other part is needed for cooperation, the sealing effect is lasting and stable, and the combined sealing element used for the thread of the hydraulic transmission pipe can be applied and promoted easily.