The invention relates to a green brick of a single-firing glass ceramic composite board. The green brick comprises a green body layer and a glass ceramic frit layer from bottom to top, and further comprises a fixing layer arranged on the surface of the glass ceramic frit layer, the fixing layer is formed by spraying a glass ceramic frit particle fixing agent, the glass ceramic frit particle fixing agent comprises the following components in percentage by weight: 5.0-6.0% of a vitamins thickener, 2.0-2.8% of attapulgite, 1.1-1.4% of a defoamer, 1.2-1.8% of a dispersing agent and the balance of a solvent. When the green brick is used, a glass ceramic frit particle on the surface cannot be taken away by an air draught in a preheating zone in the firing, so that the waste is avoided, and the defect rate of a product of the glass ceramic composite board is reduced.