The utility model discloses a grate plate of a household refuse incinerator and a grate of the household refuse incinerator and belongs to the field of devices of household refuse incinerators. Two tie rods are transversely and fixedly arranged on a plate body of the grate plate. The two tie rods are arranged on the windward surface of the grate plate. Based on the grate plate, the utility model further provides the grate of the household refuse incinerator. The grate of the household refuse incinerator comprises a plurality of grate plates. The grate plates are arranged in rows and lines to constitute a grate structure. Due to the fact that the two parallel transverse tie rods are additionally arranged, the structural strength of the grate plate is improved, the heat dissipation effect is improved, the air volume distribution on the overall grate surface is improved, and the service life of the grate is prolonged. Therefore, the problems that a grate plate of an incinerator of an existing type is low in bearing capacity and short in service life and distribution of primary air is unreasonable in the combustion process of the grate are solved.