Chain type pipe pliers are a mechanical tool that realizes the clamping function through the friction between the chain and the surface of the pipe fitting. Its core structure consists of a clamp handle, chain assembly and adjustment mechanism, which controls the chain winding length to accommodate different diameters of pipe fittings through rotatable adjustment bolts. This tool adopts the working principle of meshing and transmitting torque between the chain and the front end of the clamp handle, which can not only meet the high-intensity operation needs of metal pipe fittings, but also suitable for non-destructive clamping of pipe fittings made of fragile materials such as ceramics and plastics. Some improved models integrate an automatic locking mechanism, realize the automatic chain tightening function through ratchet and pull spring assembly, and some patented solutions also add a blast cleaning module to reduce the impact of work dust on tool life.