The invention provides dirt-resistant diatom ooze coating, relates to interior wall coating, in particular to dirt-resistant diatom ooze coating and a construction method thereof. The dirt-resistant diatom ooze coating comprises a flat coating type diatom ooze bottom material and an air-permeable surface layer material. The invention provides the dirt-resistant diatom ooze coating and the construction method thereof. The dirt resistance of the conventional diatom ooze coating is improved by spray-coating the diatom ooze surface layer with a waterproof and air-permeable material, so that the dirt-resistant diatom ooze coating is healthy, environmentally friendly and high in dirt resistance. One layer of hydrophobic air-permeable film is formed on the wall surface, so that the air permeability and the air purifying function of the conventional diatom ooze are kept, the dirt resistance of the conventional diatom ooze can be greatly improved, and the dirt-resistant diatom ooze coating is healthy, environmentally friendly and worthy of promoting vigorously.