In the core drilling construction, downhole accident is unavoidable and the block of drill pipe, drilling tools and casing are frequently occur. Reverse thread drill pipe cannot get off the block at ideal position and the pipe cutter is commonly used to continue the construction to reduce the economic loss. A new pipe cutter was designed in the engineering practice with reliable working performance; comparing with previously used pipe cutters, it has characteristics of simple structure, easy operation, wide application range (pipe with minimum inner diameter of 60mm can be cut), high working efficiency and good generality.