The plum blossom coupling is closely combined with the main body of the two half coupling with polyurethane plastic as the elastic element, and the main body is mainly made of alloy aluminum. It is applicable to servo system, spindle drive, lifting platform, machine tool drive and gearbox motor. Compact, no backlash, which can absorb vibration and compensate radial and angular deviation. It is mainly suitable for working places with frequent starting, forward and reverse rotation, medium-high speed, medium torq.