The invention relates to the field of ore separating devices, in particular to a four-cylinder modularized high-intensity magnetic separator. The four-cylinder modularized high-intensity magnetic separator comprises a first module, a second module and a third module. The first module, the second module and the third module are sequentially arranged from top to bottom. The first module includes a first box body and a roughing assembly; the second module includes a second box body, a concentrating assembly and a scavenging assembly, and the concentrating assembly and the scavenging assembly are arranged at intervals; and the third module includes a third box body and a blending separation assembly. The roughing of ore materials is completed by the roughing assembly in the first box body; concentrating and scavenging of magnetic materials and non-magnetic materials subjected to roughing are conducted by the concentrating assembly and the scavenging assembly in the second box body correspondingly; and mixture materials obtained after concentrating and scavenging are further separated by the blending separation assembly. According to the four-cylinder modularized high-intensity magnetic separator, roughing, concentrating, scavenging and blending separation can be simultaneously completed; and it is equivalent to the fact that two times of scavenging and two times of concentrating are conducted on the ore materials. Further, the four-cylinder modularized high-intensity magnetic separator is compact in structure, small in occupied area and high in separating efficiency; and total power consumption of the separator is lowered, and the energy-saving effect is obvious.