Diaphragm coupling can compensate the axial, radial and angular deviation between the driving machine and the driven machine caused by manufacturing error, installation error, bearing deformation and temperature rise change. Diaphragm coupling is a flexible coupling with metal elastic elements, which relies on the diaphragm of metal coupling to connect the driving and driven machines to transmit torque. It has the advantages of elastic vibration reduction, no noise and no lubrication, and is an ideal product to replace tooth coupling and general coupling today.