The utility model belongs to power construction tools, especially to an auxiliary clamp for replacing a linear insulator, which comprises fastening nuts (7), gaskets (6), fastening bolts (5), a first main clamping plate (1), a second main clamping plate (8), a first auxiliary clamping plate (2) and a second auxiliary clamping plate (4). The first and second main clamping plates (1), (8) are locked and connected via the fastening bolts (5), the fastening nuts (7) and the gaskets (6), the lower of the first main clamping plate (1) is locked and connected with the first auxiliary clamping plate (2) via the fastening bolts (5), the fastening nuts (7) and the gaskets (6), the lower of the second main clamping plate (8) is locked and connected with the second auxiliary clamping plate (4) via the fastening bolts (5), the fastening nuts (7) and the gaskets (6), and two lower ends of each of the first and second main clamping plates are fixedly connected with a U-shaped bolt (3) via the fastening nuts (7) and the gaskets (6). The auxiliary clamp for replacing the linear insulator can separate hanging points of tools, work is more convenient, and working efficiency is greatly improved.