Fiber laser is used to cut carbon steel plate with different thickness at short distance and long distance to study whether fiber laser is suitable for cutting carbon steel plate. Experimental results indicate that selecting an appropriate cutting speed significantly enhances the slit surface quality of carbon steel plates. The fiber laser demonstrated the capability for fine cutting of carbon steel plates up to 30 mm thick at short distances and rough machining of plates up to 50 mm thick at long distances. These findings highlight the potential of fiber lasers to meet diverse industrial cutting requirements.