The invention belongs to the field of the electrical equipment and relates to a cable terminal test hydraulic support of a GIS cable pressure gas chamber. The cable terminal test hydraulic support comprises a bottom beam; traveling wheels are mounted at the four corners of the bottom of the bottom beam; a pull rod is hinged to the front end of the upper surface of the bottom beam and a hand rail is arranged on the front end of the pull rod; a swing rod is connected to the bottom beam by use of a rotating shaft; a telescopic arm is connected to the front end portion of the swing rod and a sliding groove is formed in the telescopic arm; one end of a crank arm is slidingly connected to the sliding groove by use of a slider, while the other end of the crank arm is connected with the ratchet end of a ratchet rod; the lower end of the ratchet rod is hinged to the bottom beam; a fan-shaped angle regulating piece is hinged to the outer end of the telescopic arm; the top end of the fan-shaped angle regulating piece is fixedly connected to a top beam; jacking oil cylinders are arranged on the two ends of the top of the top beam, respectively; supporting blocks are connected to the end portions of the piston rods of the jacking oil cylinders. The cable terminal test hydraulic support of the GIS cable pressure gas chamber is simple in structure and reasonable in design; the jacking oil cylinders are arranged on the movable bottom beam so that the hydraulic support can be moved conveniently and quickly.