The utility model relates to a frame is accomodate to convenient formula substation grounding line, the flatness detection apparatus comprises a pedestal, the bed frame includes two perpendicular roofbeams and connects two crossbeams between two perpendicular roof beams, the frame is accomodate to equal insulator spindle of fixedly connected with on two perpendicular roof beams, fixedly connectedwith earth connection winding form between two crossbeams, the frame is accomodate to the insulator spindle and earth connection winding form is located the planar both sides in bed frame place respectively, two perpendicular roof beams that an one side was taken in to bed frame fixed connection insulator spindle are close to lower extreme department and fixed connection has the bottom plate, thebottom plate is perpendicular with the bed frame, and two perpendicular roof beams that are located the bottom plate below are connected with the gyro wheel respectively, the utility model disclosessimple structure, the cost of manufacture is low, the installation gyro wheel for fortune dimension personnel can be easily with ground wire propelling movement to the scene of articulating, the gyrowheel uses polyurethane idler wheel, is fit for the operational environment of transformer substation, frame is accomodate to convenient formula substation grounding line is showing to have shortenedand is lifting among the operation process time spent of transporting the earth connection, has saved the manpower, has practiced thrift the cost.