The invention discloses a spring vibration-absorbing type inter-phase spacer for a 500-kV overhead power transmission line. The spring vibration-absorbing type inter-phase spacer comprises a spacer frame and a spacer connecting line clamp arranged on the spacer frame and further comprises a telescopic connecting piece; one end of the telescopic connecting piece is connected with the spacer frame; connecting hardware connected with an insulator is arranged at the other end of the telescopic connecting piece. As the telescopic connecting piece is additionally arranged on the spacer frame, the regulating quantity of an inter-phase clearance can be automatically regulated according to actual working conditions, so that the line dancing energy can be effectively released, and line dancing is quickly eliminated; meanwhile, the problems of bolt looseness on the spacer connecting line clamp due to long-time line dancing, damage by line pressing and the like are solved; moreover, different lines can be well adapted to, and the occurrence of hardware abrasion and rod type insulator core rod bending fatigue fracture is avoided. The spring vibration-absorbing type inter-phase spacer disclosed by the invention is suitable for the power transmission line.