A sheathing-type earphone structure is composed of a seat, an end of which is extended with an ear-loop being parallel connected to the other end of which, and which is opened with a through-hole; an earphone body, which is formed integrally, and is correspondingly sheathed in the aforementioned seat, an end of which is extended with a leading wire being transfixed out of the aforementioned through-hole and being connected to a sound source. Accordingly, when a user sheaths the earphone on ears for listening, if the leading wire is carelessly pulled, the seat will become a buffer due to that the through-hole of seat provides for the transfixing of leading wire of earphone body, thereby preventing the leading wire from being broken at a connection position of the earphone, by excessively pulling.