Flexible propeller shaft coupling including clamping shaft coupling,encoder shaft coupling,sliding shaft coupling,spring shaft coupling,bellows shaft coupling, using common sleeve to join in some way two clamping shaft coupling, the coupling clamp shell two half coupling flange bolt connection in order to realize the spring shaft coupling, using the axial split two spherical shell in a certain way A coupling clamped to achieve a two-shaft connection sliding shaft coupling, an encoder is attached to the encoder shaft coupling.