Jig for acoustic test of in-ear earphone

The utility model discloses a jig for acoustic testing of an in-ear earphone. The jig comprises a base, a nut, a rubber plug and a sealing ring, the base is provided with a mounting hole penetrating through the upper and lower surfaces of the base; external threads are arranged on the peripheral side wall of the upper end of the base; the nut is provided with a receding hole with a downward opening, internal threads are arranged on the inner circumferential side wall of the receding hole, and a through hole is concavely formed in the upper surface of the nut. The rubber plug has a positioning hole penetrating through the upper and lower surfaces of the rubber plug; the sealing ring is provided with a through hole penetrating through the upper and lower surfaces; the lower surface of the rubber plug abuts against the upper surface of the base, the nut wraps the lower end of the rubber plug, the upper end of the rubber plug penetrates through the through hole and extends out of the upper surface of the nut, the