The utility model discloses a device for electric network line monitoring is joined in marriage in distributing type integration, include: earthing device and master station are united to the front-end collection device, the front-end collection device includes data centralization transmitter, repeater and a plurality of fault indicator who installs on distribution network three phase line, joint earthing device includes controllable reactor in short-term, controllable resistance, contactor, controller and one or more grounding transformer, grounding transformer is connected with the contactor, and controllable resistance passes through the break-make switching of contactor, inserts or disconnection distribution network three phase line, the contactor and in short-term controllable reactor be connected with the controller respectively, controllable reactor still is connected with grounding transformer in short-term. The utility model provides a device for electric network line monitoring is joined in marriage in distributing type integration can in time find the fault line and the trouble place of distribution network and select different ground connection modes according to power system fault's type, eliminates power system fault