An earphone cover with an earphone, wherein the earphone cover is used as a sleeve for the earphone, comprising: - a sleeve portion, and - a fixing portion for sleeving the earphone cover on the earphone, wherein: - the fixing portion: - encloses the sleeve portion, and the sleeve portion penetrates the fixing portion, and - includes a first end portion and a second end portion opposite to the first end portion, and - the fixing portion is provided with a hollow cavity, and - when the earphone cover is built in a human ear, the first end portion and the second end portion are in contact with an auricle to form snapping points; wherein - the second end portion comprises an upper portion corresponding to a crus helix and a lower portion corresponding to a cavitas conchae; when the second end portion is snapped on an antitragus of the auricle, the upper portion forms a snapping point with the crus helix, and the lower portion forms a snapping point with the cavitas conchae; and - when the first end portion is snapped on a tragus of the auricle, the first end portion forms a snapping point with the tragus, wherein - the fixing portion comprises a front side facing the inside of the ear and a rear side facing the opposite of the front side, characterized in that the sleeve portion having an aperture on the front side that is larger than the maximum diameter of the body of the front case of the earphone, such that a gap is formed between the front side of the fixing portion and the front case of the earphone when the earphone cover is set on the front case, and - the hollow cavity is connected with the sleeve portion thoroughly such that, when the fixing portion is built into the human ear, the fixing portion is deformed to discharge the gas in the cavity from the sleeve portion via the gap. - a sleeve portion, and - a fixing portion for sleeving the earphone cover on the earphone, - the fixing portion: - encloses the sleeve portion, and the sleeve portion penetrates the fixing portion, and - includes a first end portion and a second end portion opposite to the first end portion, and - encloses the sleeve portion, and the sleeve portion penetrates the fixing portion, and - includes a first end portion and a second end portion opposite to the first end portion, and - the fixing portion is provided with a hollow cavity, and - when the earphone cover is built in a human ear, the first end portion and the second end portion are in contact with an auricle to form snapping points; wherein - the second end portion comprises an upper portion corresponding to a crus helix and a lower portion corresponding to a cavitas conchae; when the second end portion is snapped on an antitragus of the auricle, the upper portion forms a snapping point with the crus helix, and the lower portion forms a snapping point with the cavitas conchae; and - when the first end portion is snapped on a tragus of the auricle, the first end portion forms a snapping point with the tragus, wherein - the second end portion comprises an upper portion corresponding to a crus helix and a lower portion corresponding to a cavitas conchae; when the second end portion is snapped on an antitragus of the auricle, the upper portion forms a snapping point with the crus helix, and the lower portion forms a snapping point with the cavitas conchae; and - when the first end portion is snapped on a tragus of the auricle, the first end portion forms a snapping point with the tragus, wherein - the fixing portion comprises a front side facing the inside of the ear and a rear side facing the opposite of the front side, characterized in that the sleeve portion having an aperture on the front side that is larger than the maximum diameter of the body of the front case of the earphone, such that a gap is formed between the front side of the fixing portion and the front case of the earphone when the earphone cover is set on the front case, and - the hollow cavity is connected with the sleeve portion thoroughly such that, when the fixing portion is built into the human ear, the fixing portion is deformed to discharge the gas in the cavity from the sleeve portion via the gap.