The utility model discloses a grille of a slag hopper of an incinerator, and the grille relates to the field of garbage incineration. The grille of the slag hopper of the incinerator comprises a plurality of steel bars; the steel bars are arranged longitudinally and horizontally at intervals and are welded to form a grid-like frame body; and the frame body is arranged in the inner cavity of the slag hopper. The grille is a high-strength coarse grille and has very high load bearing capability, and a repairer can directly stand on the grille when repairing the slag hopper. According to the grille of the slag hopper of the incinerator, the design of adding the grille is adopted, so that large slag blocks can be blocked, the slag ash does not drop at a lower port, and the slag hopper is not blocked.