A fiber connector plug, comprising: a fiber; 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 front cover, fastened to one end of the main housing and encircling the ferrule, wherein an end face that is of the ferrule and that is away from the fiber is a front end face of the ferrule, and an end face that is of the front cover and that is away from the main housing is a front end face of the front cover; the front end face of the ferrule is flush with the front end face of the front cover, or in an axial direction, the front end face of the ferrule is located between the front end face of the front cover and a rear end face of the front cover, wherein the rear end face of the front cover is an end face that is of the front cover and that faces the main housing; a slot is formed between the front cover and the ferrule, and the slot is used to accommodate a ferrule sleeve of a fiber adapter, so that an end face of the ferrule sleeve is located in the slot; and the ferrule is used to be inserted into the ferrule sleeve; wherein a first guide structure is disposed on an outer surface of the front cover, and the first guide structure is used to fit a guide key on the fiber adapter; wherein a second guide structure is disposed on an outer surface of the main housing, and the second guide structure and the first guide structure are connected and are jointly used to fit the guide key on the fiber adapter; wherein the second guide structure is a groove structure, a cut structure, or a protrusion structure; wherein the main housing comprises a main shaft and a mounting member that are both sleeve-shaped, and the mounting member is connected to an end that is of the main shaft and that faces the front cover; a first stop structure is disposed on an outer surface of the ferrule, the mounting member comprises a mounting member body and a second stop structure, and the second stop structure is located at a front end of the mounting member body and protrudes from an inner surface of the mounting member body; and a part of the ferrule is accommodated inside the mounting member, the first stop structure fits the second stop structure to prevent the ferrule from moving out of the mounting member from the front end of the mounting member body, and the front cover is sleeved over an outer surface of the mounting member and is fastened to the mounting member; and wherein a rear end of the fiber connector plug is an end of the fiber connector plug facing away from the ferrule; characterized in that a rear end face of the mounting member body and the rear end face of the front cover are coplanar and jointly form a connecting face, and the connecting face is in contact with an end face of the main shaft. a fiber; 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 front cover, fastened to one end of the main housing and encircling the ferrule, wherein an end face that is of the ferrule and that is away from the fiber is a front end face of the ferrule, and an end face that is of the front cover and that is away from the main housing is a front end face of the front cover; the front end face of the ferrule is flush with the front end face of the front cover, or in an axial direction, the front end face of the ferrule is located between the front end face of the front cover and a rear end face of the front cover, wherein the rear end face of the front cover is an end face that is of the front cover and that faces the main housing; a slot is formed between the front cover and the ferrule, and the slot is used to accommodate a ferrule sleeve of a fiber adapter, so that an end face of the ferrule sleeve is located in the slot; and the ferrule is used to be inserted into the ferrule sleeve; wherein a first guide structure is disposed on an outer surface of the front cover, and the first guide structure is used to fit a guide key on the fiber adapter; wherein a second guide structure is disposed on an outer surface of the main housing, and the second guide structure and the first guide structure are connected and are jointly used to fit the guide key on the fiber adapter; wherein the second guide structure is a groove structure, a cut structure, or a protrusion structure; wherein the main housing comprises a main shaft and a mounting member that are both sleeve-shaped, and the mounting member is connected to an end that is of the main shaft and that faces the front cover; a first stop structure is disposed on an outer surface of the ferrule, the mounting member comprises a mounting member body and a second stop structure, and the second stop structure is located at a front end of the mounting member body and protrudes from an inner surface of the mounting member body; and a part of the ferrule is accommodated inside the mounting member, the first stop structure fits the second stop structure to prevent the ferrule from moving out of the mounting member from the front end of the mounting member body, and the front cover is sleeved over an outer surface of the mounting member and is fastened to the mounting member; and wherein a rear end of the fiber connector plug is an end of the fiber connector plug facing away from the ferrule; characterized in that a rear end face of the mounting member body and the rear end face of the front cover are coplanar and jointly form a connecting face, and the connecting face is in contact with an end face of the main shaft.