The invention provides a high-chromium cast iron roller for tungsten modification. The high-chromium cast iron roller comprises a high-chromium cast iron working layer and a nodular cast iron roller core. Chemical components of the working layer comprise, by mass percent, 2.1%-2.9% of C, 0.4%-0.8% of Si, 0.5%-0.8% of Mn, 15%-20% of Cr, 0.5%-2% of Ni, 0.5%-2% of Mo, 0-0.4% of V, 0.2%-0.8% of Cu, 2.0%-6.0% of W, smaller than 0.15% of P, smaller than 0.15% of S and the balance iron. During preparation, a composite centrifugation method is adopted for casting, a formed roller obtained through casting is subjected to demolding when the surface temperature of the working layer ranges from 800 DEG C to 850 DEG C, air cooling is carried out till the temperature ranges from 200 DEG C to 300 DEG C,then heat preservation is carried out for 5 h to 10 h, the temperature is increased to range from 950 DEG C to 980 DEG C with the speed ranging from 9 DEG C/h to 12 DEG C/h, heat preservation is carried out for 30 min to 60 min, quenching is carried out, then the temperature is increased to range from 280 DEG C to 300 DEG C for tempering, heat preservation is carried out for 8 h to 10 h, and the high-chromium cast iron roller is obtained. The high-chromium cast iron roller for tungsten modification has good corrosion resistance, wear resistance and hot crack resistance, and the service life ofthe roller is prolonged.