Integrated high-rigidity coupling

The utility model discloses an integrated high-rigidity coupling which comprises a cylindrical body with an axial through hole formed in the center, and T-shaped grooves correspondingly formed at two ends of the cylindrical body. Each T-shaped groove comprises an arc groove enabling the side face of the T-shaped groove to be communicated with the through hole and perpendicular to the cylindrical body in the axial direction and a straight groove axially arranged and in perpendicular intersection with the center of the arc groove, wherein a locking mechanism is formed between bodies on two sides of the straight groove. The T-shaped grooves and the locking mechanisms are arranged at two ends of the coupling, a central spindle can be effectively held tightly for transmission through deformation of groove openings, the creative integrated design is more reliable and higher in rigidity than a traditional membrane structure, and damage to the coupling by cracks generated on a membrane or any other forms can be avoid