The invention discloses a teaching demonstration device for the torsion resistance of a steel member, and the device comprises a lower bottom plate and an upper supporting plate, which are arranged to be opposite to each other in a vertical direction, and are connected with each other through a vertical supporting assembly therebetween. At least one group of clamping apparatuses are disposed between the lower bottom plate and the upper supporting plate. Each group of clamping apparatuses comprise clamping parts which are arranged to be opposite to each other in a vertical direction, wherein the lower clamping part is installed on the lower bottom plate through a floating part, and the upper clamping part is installed on the upper supporting plate through a rotating part. The device can be made into a simulation part of the steel member through a wood bar when the device is used in daily teaching, and two ends of the simulation part are clamped by the two clamping parts. The upper clamping part is driven by the rotation of a rotating hand wheel to rotate, and the simulation part rotates along with the clamping part to generate torsional deformation, thereby bringing convenience to students for visually observing and understanding the torsional deformation of the steel member.