The invention relates to a method of preparing a domestic ceramic by coal ash. The method comprises the following steps: by mainly taking a solid waste coal ash, clay and feldspar as raw materials, preparing a ceramic blank; carrying out surface treatment on the ceramic blank; and finally, sintering at a high temperature to obtain the domestic ceramic with excellent performance. The domestic ceramic is produced by taking the industrial solid waste coal ash, clay and feldspar as the raw materials, and the doping amount of the coal ash can reach up to 60%, so that the production cost of the ceramic is lowered, thereby solving the condition that the coal ash is insufficient to use and pollutes the environment and protecting the ecological environment. The produced domestic ceramic has the advantages of smooth surface, durability and the like, and can be widely applied to the ceramic manufacturing field and the field of comprehensive utilization of the industrial solid wastes.