The present invention provides a honeycomb grate incinerator, including a furnace mantle, characterized in that furnace brick lining (30) and honeycomb grate (20) are built in the furnace mantle (10); honeycomb grate (20) has grate having hollow passage (21), the outboard end of the honeycomb grate (20) is cotact with the internal surface of the furnace mantle (10), the inner end has multiple air gates (22) to connect the hollow passage (21) and the furnace (12); the hollow passage (21) is also connected with the suction port (11). The honeycomb grate (20) is composed of multiple grate bricks (20A). The grate bricks is composed of two grate cells (20B). The invention realizes complete combustion of the city household garbage, having better environment protection. The equipment has less amount, low investment. The furnace of the special grate bricks made by grate cells is convenient change. The invention burns according to the process requirement, especially fit for burning adopting gasification-incineration synthesis gas method.