Double-diaphragm airtight coupling complementary earphone

The utility model discloses a double-diaphragm airtight coupling complementary earphone. The earphone comprises an earphone shell, a triangular fixing block and an end cover, the end cover is positioned on one side of the earphone shell; a fixing mechanism for fixing the end cover is arranged in the triangular fixing block; a mounting box is welded in the earphone shell; the two triangular fixingblocks are arranged in parallel; the two triangular fixing blocks are welded to one symmetrical side face of the mounting box. A loudspeaker, a first vibrating diaphragm and a second vibrating diaphragm are bonded in the mounting box, the first vibrating diaphragm and the second vibrating diaphragm are located on one symmetrical side face of the mounting box respectively, the loudspeaker is located between the first vibrating diaphragm and the second vibrating diaphragm, through holes are formed in the upper top and the lower bottom of the earphone shell, and the two through holes are communicated with the interior of