Rotary insertion core polarization-maintaining connector

The invention discloses a rotary insertion core polarization-maintaining connector, which comprises a socket and a plug which are in plugging connection, and is characterized in that the socket comprises a fixed seat, the fixed seat is provided with a mounting hole penetrating along the plugging direction and a groove formed in the inner wall of the mounting hole and close to the tail end; the elastic piece is embedded in the groove, the elastic piece is provided with a sheet-shaped abutting part, and the sheet-shaped abutting part keeps the state of inclining towards the center of the mounting hole when not subjected to external force; the fiber core holding assembly is provided with a third step surface which is arranged towards the tail end; in an assembling state, the sheet-shaped abutting part abuts against the third step surface to limit the fiber core maintaining assembly to axially slide towards the tail end. And the sheet-shaped abutting part can be extruded by external force to deform towards the in