The invention provides an overhead insulated conductor stripper, comprising a stripper head assembly, a knife holder assembly and an operation rod. The stripper head assembly comprises a shell, a base, a first bevel gear, a second bevel gear, a first pinion, a second pinion, a large gear and a knife holder assembly mounting base. The knife holder assembly mounting base comprises a left mounting base and a right mounting base. The left mounting base and the right mounting base are fixedly set on the large gear. The knife holder assembly comprises a left knife holder, a right knife holder, a knife and a knife holder. Locking knobs are set on the left mounting base and the right mounting base. The left knife holder and the right knife holder are mounted on the left mounting base and the rightmounting base through utilization of the locking knobs. A conductor clamping hole fitting with an outer diameter of an overhead insulated conductor is formed between the left knife holder and the right knife holder. The knife holder is fixedly set on one of the mounting bases. The knife is fixedly mounted on the knife holder. An adjustment bolt is set on the knife base. The overhead insulated conductor stripper provided by the invention fit with the insulated conductors of different sizes. Stripping thickness of the insulated conductors can be adjusted.