Novel special-shaped combined fastener

The utility model provides a novel special-shaped combined fastener which comprises a threaded sleeve, a main fixing bolt is arranged in the threaded sleeve, a connecting shaft is arranged at the lower end of the main fixing bolt, circular notches are symmetrically formed in the two sides of the connecting shaft, a clamping assembly is arranged in each circular notch, and the clamping assemblies are arranged in the threaded sleeve. Each clamping assembly comprises a fixing shaft, an extension spring is arranged at the end, away from the inner wall of the circular notch, of each fixing shaft, a connecting ring body is arranged at the end, away from the corresponding fixing shaft, of each extension spring, and a hemispherical clamping block is arranged at the end, away from the corresponding extension spring, of each connecting ring body. Each hemispherical clamping block and the corresponding hemispherical groove module are matched with each other, through the clamping assemblies, the situation that after lock