An earphone, wherein the earphone comprises: a casing, wherein a receiving cavity is formed inside the casing, and the casing is provided with a first mounting hole connecting with the receiving cavity; and a sound guiding tube, wherein one end of the sound guiding tube is a movable end, and the other end of the sound guiding tube is a mounting end, a sound guiding channel passing through the movable end and the mounting end being provided inside the sound guiding tube, and the movable end being configured to rotate in the first mounting hole so as to enable the sound guiding tube to rotate relatively to the casing; the sound guiding tube is configured to be manually installed into the first mounting hole so as to be manually detachable from the first mounting hole; characterized in that: the earphone further comprises a mounting plate, wherein the mounting plate is fixedly mounted in the receiving cavity and the mounting plate completely blocks the first mounting hole from connecting with the receiving cavity around the peripheral side of the mounting plate that is in contact with an inner wall of the casing of the receiving cavity; and one end of the mounting plate adjacent to the first mounting hole is provided with a sound-transmitting groove; a first mounting slot, configured to mount a sounding unit, is disposed at one end of the mounting plate away from the first mounting hole, a first sound-transmitting hole is disposed at a bottom of the first mounting slot, and the first sound-transmitting hole is in connection with the sound-transmitting groove; and when the movable end portion is installed in the first mounting hole, the sound guiding channel connects with the sound-transmitting groove. a casing, wherein a receiving cavity is formed inside the casing, and the casing is provided with a first mounting hole connecting with the receiving cavity; and a sound guiding tube, wherein one end of the sound guiding tube is a movable end, and the other end of the sound guiding tube is a mounting end, a sound guiding channel passing through the movable end and the mounting end being provided inside the sound guiding tube, and the movable end being configured to rotate in the first mounting hole so as to enable the sound guiding tube to rotate relatively to the casing; the sound guiding tube is configured to be manually installed into the first mounting hole so as to be manually detachable from the first mounting hole; characterized in that: the earphone further comprises a mounting plate, wherein the mounting plate is fixedly mounted in the receiving cavity and the mounting plate completely blocks the first mounting hole from connecting with the receiving cavity around the peripheral side of the mounting plate that is in contact with an inner wall of the casing of the receiving cavity; and one end of the mounting plate adjacent to the first mounting hole is provided with a sound-transmitting groove; a first mounting slot, configured to mount a sounding unit, is disposed at one end of the mounting plate away from the first mounting hole, a first sound-transmitting hole is disposed at a bottom of the first mounting slot, and the first sound-transmitting hole is in connection with the sound-transmitting groove; and when the movable end portion is installed in the first mounting hole, the sound guiding channel connects with the sound-transmitting groove.