The invention relates to a multifunctional cable testing support. The multifunctional cable testing support is characterized in that insulating transparent materials which meet the voltage-testing requirements are adopted to make a box body, the interior of the box body is divided into three independent spaces, and round holes corresponding to independent spaces are reserved on one side surface of the box body. Three-phase cables at the tail end of the cable are inserted into three round holes when testing, and the round holes can support and fix the tail end of the cable; moreover, the tail end of the cable is separated alternately and oppositely and insulated through the multifunctional cable testing support, so that misjudgment and discharging caused by overlarge leakage current are avoided; and the insulating transparent materials are adopted to wrap the tail end of the cable, and warnings of 'Testing, shock hazard' are sticked to an attracting position of the box body to guarantee personal safety of testers and passengers, so that the multifunctional cable testing support is especially applicable to cable testing operations in a downtown area with dense population.