The invention relates to a high-voltage test shielding cover for a 10kV ring main unit. The high-voltage test shielding cover is particularly suitable for commissioning tests of the 10kV ring main unit. A structure body of the high-voltage test shielding cover comprises a cover body and a sleeve. The cover body and the sleeve are coaxially arranged. The cover body is of a circular truncated cone shape. The sleeve is an equal-diameter round pipe. The size of the cover body of the circular truncated cone shape is matched with that of the incoming and outgoing line sleeve. The size of the sleeve is matched with that of a cable. The cover body and the end of the sleeve are provided with elastic fastening pieces. The high-voltage test shielding cover fundamentally solves the problem that the ring main unit can not apply enough alternating-current voltage, ensures that the tests are carried out smoothly and accurately and the high-voltage tests inspect integral insulation of the ring main unit accurately, and provides a powerful evidence for whether the ring main unit can be put into operation.