The invention provides a cable terminal bracket device for a high-potential test. The cable terminal bracket is formed through mutually buckling two semi-circle ring pillar cable clamps (1 and 1') both made of high-intensity insulating materials; two buckling edges of each semi-circle ring pillar cable clamp are provided with a convex and a groove respectively; and the two semi-circle ring pillar cable clamps are buckled through the manner that the convexes are buckled with the grooves. The cable terminal bracket provided by the invention has the characteristics of detachability, portability, simplicity and convenience for operation and strong adaptive capacity, and can meet the requirements of performing cable terminal high-potential tests under different environments.