An assistance tool for high-voltage porcelain-housed fuse replacement relates to the field of power equipment maintenance. A base is composed of a clamping ring A (4) and a clamping ring B (6) which are fixed together by a bolt B (3) and a bolt C (5), and the clamping ring A (4) and the clamping ring B (6) are in threaded connection with a movable ring (1) through a bolt A (2) and a bolt D (7) respectively. The beneficial effects are as follows: the assistance tool of the invention has multiple functions, and is easy to use, safe and reliable, and simple in structure; a voltage transformer is added with a high-voltage fuse, and the high-voltage fuse can be safely, conveniently and quickly replaced in time after breaking; the power-off time of equipment is reduced, power loss is reduced, the reliability of power supply is improved, and the work intensity is lowered; a strong guarantee is provided for time-saving and labor-saving maintenance; and the assistance tool has a small size, is easy to carry during climbing, and has the advantages of being energy-saving, safe, beautiful, simplified, and the like.