The present invention discloses an axial compression teaching demonstration system for a rigid member. The system comprises a bottom plate. The bottom plate is provided with a support frame. A lower pressing plate is slidably sleeved onto the support frame. A clamping self-adaptive device is arranged between the lower pressing plate and the bottom plate. The clamping self-adaptive device comprises two sets of clamping assemblies. The two sets of clamping assemblies are respectively and fixedly arranged on the bottom plate and the lower pressing plate. Each pressing assembly comprises a base arranged on the bottom plate or the lower pressing plate. A twisting seat is arranged on the base. The twisting seat is provided with a test seat. According to the technical scheme of the invention, during the daily teaching process, steel component simulation members of various cross sections can be manufactured by adopting wood strips. According to different structural forms of simulation members, different clamping grooves are adopted to install and fix the simulation members. After that, an axial compression force is applied onto the simulation members. After the simulation members are axially compressed, the twisting deformation of the simulation members is generated. Meanwhile, a rotary bearing is rotated to be adapted to the twisting deformation. Students can intuitively observe and acknowledge the axial compressive deformation process of simulation members. Meanwhile, the same mounting seat can be adapted to simulation members of different cross sections.