The invention relates to an earphone socket and a terminal device. The earphone socket comprises: a housing, a cover plate and an earphone connection portion; wherein the earphone connection portion includes: an earphone jack, an insulated base of at least one conductive spring, and a circuit board disposed on the outer wall of the insulated base and electrically connected to the conductive spring for transmitting an audio signal; the housing sleeves the outside of the earphone connection portion. The cover plate covers one end of the housing to seal one end of the housing, wherein the one end of the housing is the end far from the inlet end of the earphone jack. Since the outside of the earphone connection portion is sleeved by the housing and one end of the housing is sealed by the cover plate so that liquid cannot flow into a terminal apparatus through the earphone jack and the terminal apparatus is effectively protected.