The present invention discloses an earphone cover and an earphone assembly. The earphone cover having a through hole running axially through thereof. The earphone cover comprises a first attachment end, a second attachment end, a support portion, and a space defined by the support portion. The first and second attachment ends are positioned at each end of the through hole respectively. The support portion is set between the first and second attachment ends. The space is configured between an inner surface of the support portion and an outer surface of the earphone. The support portion deforms and air in the space escapes via the first and/or the second attachment ends under compression, and the support portion recovers to an original shape when the compression is removed.