The invention discloses a distribution technology of a once fired microcrystal composite brick, which comprises the following steps: S00, transporting frit micropowder in a storage tank in a blanking device through a transmission device; S01, uniformly distributing the frit micropowder on a uniformly balancing conveyer belt by the blanking device; S02, uniformly spraying the frit micropowder on a raw brick on a raw brick conveyer belt by the uniformly balancing conveyer belt, wherein the step S00 comprises the following three sequentially connected processes: (a) blanking and laying the frit micropowder in the storage tank on a bucket type conveyer belt; (b) transporting the frit micropowder on a movable conveyer belt by the bucket type conveyer belt; (c) transporting the frit micropowder in the blanking device through a blanking hopper by the movable conveyer belt. The distribution technology not only solves the problems that frit distribution on the raw brick is non-uniform, the frit is wasted, and the frit processing cost is high, patterns on the produced ceramic brick are stable and natural, and fine in texture, and besides, the product quality is improved.