Shock-absorbing device of shockproof joint

The invention provides a shock-absorbing device of a shockproof joint, and the shock-absorbing device comprises a left shock-absorbing unit and a right shock-absorbing unit which are symmetrically arranged on concrete structures at two sides of the shockproof joint, wherein the left shock-absorbing unit and the right shock-absorbing unit comprise steel barrels with inner sides which are embedded into the concrete structures; each steel barrel is internally provided with a piston with a piston rod, and a spherical steel cover plate is arranged at the outer end of each piston rod; a spring is arranged between each spherical steel cover plate and each concrete structure; the outer edge of each steel barrel is level with each concrete structure and is fixedly arranged through arranging an annular steel barrel cover plate; a spring is arranged between each spherical steel cover plate and each annular steel barrel cover plate; and the outer end of each piston rod is at least provided with two layers of spherical st