A fiber connector plug (100, 300), comprising: a fiber and a ferrule fastened to a front end of the fiber; a main housing, sleeve-shaped and sleeved over a periphery of the fiber; and a first locking structure, disposed on an outer surface of the main housing, and configured to fit a second locking structure on a fiber adapter to fasten the fiber connector plug (100, 300) to the fiber adapter, wherein the first locking structure comprises a sliding member having a central axis and a locking part, the locking part is fastened to the outer surface of the main housing, and the sliding member is slidably connected between a first position and a second position to the main housing; the locking part is located between the sliding member and the ferrule along an axial direction of the main housing; and when the sliding member is located in the first position, the sliding member fits the locking part to jointly lock the second locking structure; or when the sliding member is located in the second position, unlocking between the locking part and the second locking structure is implemented, characterized in that the locking part is configured to fit a clamping groove of the second locking structure, a locking groove is formed between the sliding member and the main housing, the locking groove is configured to fit an elastic arm of the second locking structure, an opening of the locking groove is located between one end of the sliding member and the main housing, the sliding member comprises a fitting surface formed on an inner wall of the locking groove, the fitting surface faces the main housing, the fitting surface comprises a first area and a second area, the first area is located between the second area and the opening of the locking groove, and a radial distance between the first area and the central axis is greater than a radial distance between the second area and the central axis; wherein when the sliding member is located in the first position, the first area is disposed opposite to the locking part, and the second area is disposed opposite to the outer surface of the main housing where no locking part is fastened to; or when the sliding member is located in the second position, the fitting surface is disposed opposite to the outer surface of the main housing where no locking part is fastened to. a fiber and a ferrule fastened to a front end of the fiber; a main housing, sleeve-shaped and sleeved over a periphery of the fiber; and a first locking structure, disposed on an outer surface of the main housing, and configured to fit a second locking structure on a fiber adapter to fasten the fiber connector plug (100, 300) to the fiber adapter, wherein the first locking structure comprises a sliding member having a central axis and a locking part, the locking part is fastened to the outer surface of the main housing, and the sliding member is slidably connected between a first position and a second position to the main housing; the locking part is located between the sliding member and the ferrule along an axial direction of the main housing; and when the sliding member is located in the first position, the sliding member fits the locking part to jointly lock the second locking structure; or when the sliding member is located in the second position, unlocking between the locking part and the second locking structure is implemented, characterized in that the locking part is configured to fit a clamping groove of the second locking structure, a locking groove is formed between the sliding member and the main housing, the locking groove is configured to fit an elastic arm of the second locking structure, an opening of the locking groove is located between one end of the sliding member and the main housing, the sliding member comprises a fitting surface formed on an inner wall of the locking groove, the fitting surface faces the main housing, the fitting surface comprises a first area and a second area, the first area is located between the second area and the opening of the locking groove, and a radial distance between the first area and the central axis is greater than a radial distance between the second area and the central axis; wherein when the sliding member is located in the first position, the first area is disposed opposite to the locking part, and the second area is disposed opposite to the outer surface of the main housing where no locking part is fastened to; or when the sliding member is located in the second position, the fitting surface is disposed opposite to the outer surface of the main housing where no locking part is fastened to.