Roller manufacturing and repairing method

The invention mainly relates to a roller manufacturing and repairing method which comprises the following steps that a roller core is manufactured and pretreated, and the roller core is a new roller core or is made of a roller to be repaired; preheating the roller core, and drying the welding wire and the welding flux at the same time; surfacing a base layer by adopting a low-carbon alloy welding wire; a transition layer is overlaid, the transition layer evenly covers the base layer, and the content value of elements such as the C element, the Fe element and the Ni element contained in materials of the transition layer ranges from the content value of corresponding elements of the materials of the working layer to the content value of corresponding elements of the materials of the base layer; surfacing a working layer by adopting a Ni-based material; surfacing a process layer; carrying out postweld heat treatment on the roller subjected to surfacing; and machining the process layer. By means of the roller man