The utility model relates to a steel cutting machine and belongs to the technical field of building machines. According to the steel cutting machine, a cutting table is horizontally arranged on a support, rolling wheel grooves are evenly formed in the edges and the middle of the cutting table, and rolling wheels are arranged in the rolling wheel grooves. A grinding wheel shaft support is mounted on one side of the cutting table and provided with a grinding wheel shaft, and the grinding wheel shaft is connected with grinding wheels. A grinding wheel flywheel is connected to the grinding wheel shaft and close to the outer side of the grinding wheel shaft support, and the grinding wheel flywheel is connected with a motor through a V-shaped belt. The steel cutting machine is simple in structure and suitable for being used for various construction sites, and can be conveniently used for construction operation of families.