The invention discloses a deformable upstream line holder, comprising a first holding lever and a first bending lever hinged to each other through a rotating shaft, wherein a driving mechanism for driving the first bending lever to rotate relative to the first holding lever is arranged between the first holding lever and the first bending lever. The inside of the first bending bar is slidably provided with a second bending bar, and a telescoping mechanism for defining relative positions of the first bending bar and the second bending bar is provided between the first bending bar and the secondbending bar. The outer side of the first grip lever is slidably provided with a second grip lever, and a positioning mechanism for defining the relative positions of the first grip lever and the second grip lever is provided between the first grip lever and the second grip lever. The second bending rod is provided with a clamp assembly. The clamper not only can be deformed according to the position of the copper bar to be connected, but also can operate the opening and closing of the clamping clamp assembly from the outside without requiring a person to enter the switchgear cabinet, so that the operation is convenient and the safety is improved.