The invention discloses a working robot system and a working method for disconnecting or connecting a drainage wire of a distribution network in an alive state. The system includes an insulated mobileplatform and a working robot platform disposed on the insulated mobile platform. The insulated mobile platform is a crawler overhead work vehicle. The working robot platform is installed on the tailend of the insulated telescopic arm of the insulated mobile platform. The working robot platform includes a square control box, and a group consisting of a catching mechanical arm, a peeling mechanical arm, and an installation mechanical arm which are mounted on the side wall of the square control box. The robot arms of the three mechanical arms are all multi-joint multi-degree-of-freedom arms. The end portions of the three mechanical arms are connected to a clamping tail end, a peeling tail end and a clip mounting tail end respectively. The working robot platform also includes a tool transferdevice and a cross-shaped slide table. The bottoms of a pair of side walls of the control box have mounting grooves. The tool transfer device is fixed to the bottom plate of the control box, and is mainly used for conveying equipment wire clamps, wire cleaning brushes, conductive grease-coating tools and insulating sheaths to the catching mechanical arm. The bottom plate of the control box is installed on the cross-shaped slide table and can be moved forward, backward, left and right.