The invention belongs to the field of metallurgical equipment, in particular to a method for reforming a continuous casting machine for solving the liquid level fluctuation of a crystallizer. An arc area of the continuous casting machine comprises a plurality of sector sections; and driving rollers and free rollers are distributed along inner arcs and outer arcs of the section sections. The method is characterized in that the driving rollers distributed on the inner arcs and the outer arcs of the first sector section and the second sector section at the beginning of the arc area are used as reference rollers; and by reducing the diameters of the free rollers on two sides of the driving rollers of the first sector section and the second sector section and adjusting the space between the free rollers and the reference rollers and the space among the free rollers, the periodic change of liquid core volume can be damaged by the periodic change of bulging quantity of a casting blank, which is generated because the space between the free roller of the whole sector section and the free roller is the same as the space between the free rollers. The invention provides the method of the continuous casting machine for solving the liquid level fluctuation of the crystallizer, which has the advantages of favorable interchangeability, no influence on normal production of the continuous casting machine, low expense, small workload and easy implementation.