The invention discloses a heavy-load grinding wheel. The heavy-load grinding wheel comprises the following components in percentage by weight: sintered corundum, fused alumina zirconia, brown fused alumina, a coupler, phenol-formaldehyde resin powder, elastic polyvinyl chloride powder, cryolite powder, light calcium carbonate micro powder and impregnation chopped glass fibers and is prepared by a hot pressing molding process. The elastic polyvinyl chloride resin powder is mixed in a grinding material, so that the tenacity and the shock absorbing effect of the grinding wheel are improved, and the probability of sheet blasting is greatly reduced. On the other hand, elastic polyvinyl chloride has excellent flame resistance, so that burning of grinding heat to phenol-formaldehyde resin is reduced, the bonding ability of the phenol-formaldehyde resin to the grinding material is improved, and the grinding ratio of the grinding wheel is improved. The coupler is used for modifying the surface of the phenol-formaldehyde resin, so that the interface bonding force between the organic resin and the inorganic grinding material is stronger, and the rotation strength of the grinding wheel is improved. Furthermore, due to the adoption of the impregnation chopped glass fibers, the dissolving ability of the phenol-formaldehyde resin is favorably enhanced, and the rotation strength of the grinding wheel is further improved.