Opening combined type coupling bolt and opening combined type coupling device

The utility model relates to an opening combined type coupling bolt and an opening combined type coupling device. The opening combined type coupling bolt comprises an outer bolt, an inner bolt, a first nut, a second nut and a split edge safety pin. When the external bolt is installed on the bolt hole, the external bolt is not limited by an installation gap, the external bolt is easy to disassemble and assemble, and the technical problem that the external bolt is easy to pull and damage due to rigid contact is solved. The inner bolt is provided with the inner bolt hole, a bolt can be arranged through the inner bolt hole for disassembly, tedious procedures such as nut welding needed by conventional disassembly are avoided, and the influence of welding on the mechanical performance of the bolt body is completely eradicated. After the second nut and the inner bolt are locked, the split edge safety pin is installed on the safety hole of the inner bolt, loosening of the second nut and the first nut is limited, and