“CG1-11S” big hand-operated pipe cutter is designed based on the investigation on local practical situation. It is an economic and practical big diameter cutter. It has four paralleled road wheels and locks machine with the chains rounded steel tube. Operate the machine by hand-operated mode. It is fit for the cutting of the big diameter no-seam steel tube above 250mm.The configuration of the machine is unique and it is easy to operate and maintain .It is convenient to move. The cutting assistant-time is short. It has high reliability and is fit for using in no-power field .There are three groups paralleled installation wheel in the base-plate .Transport the four paralleled road wheels to the ragged edge installation holes and install them when cutting full diameter steel tube. This installation can improve precision.