The invention relates to a high-voltage electric test detection switching device which comprises a metal support. The metal support comprises a horizontal section, a first vertical section and a second vertical section, the first vertical section and the second vertical section are respectively positioned at two ends of the horizontal section, the upper end of the first vertical section and the upper end of the second vertical section are positioned on the same horizontal plane, a center shaft is arranged on the upper side of the metal support and is fixedly erected at the upper end of the first vertical section and the upper end of the second vertical section, a first insulating support rod, a second insulating support rod and a third insulating support rod are arranged between the first vertical section and the second vertical section, identical metal fixing discs are fixedly arranged at the upper ends of the insulating support rods, and a first high-voltage insulating plate, a second high-voltage insulating plate and a third high-voltage insulating plate are respectively connected to the other ends of the three fixing discs. The high-voltage electric test detection switching device has the advantages that high-voltage extension lines are difficult to abrade and crack, accordingly, the service lives of the high-voltage extension lines can be prolonged, the high-voltage electric test detection switching device is applicable to places in various fields and is high in practicality, and safe switching effects can be realized.