The invention discloses an elastic collision demonstration device for physics teaching. The device comprises a column, a main shaft, a suspender bearing sleeve, a collision ball body, a rod bearing sleeve, a reaction rod body, a sleeve, a limit concave ring, a spring washer, a connecting piece, a tie bar, a reset spring, a mounting frame, a locking piece, a fixing clamping member, an upper end plate, a lower end plate, a locking bolt, a clamping groove and a suspender. The device is advantaged in that the device is convenient to use, is convenient to carry and is quite convenient to observe, determinants of the rotational inertia and influence on rotation of a rigid body can be directly shown through demonstration, angular momentum and rotational kinetic energy are indirectly reflected, the conservation law is verified, these concepts are gradually clarified, the relevant laws are correctly understood, phenomena are obvious, conclusion is intuitive, students are facilitated to think independently, the learning atmosphere is lively and lively, moreover, the device is simple and convenient to install, the device can be simply fixed at an edge of a table, the area of an experimental bench is greatly reduced, and other experimental items are convenient to dispose.