The invention discloses a preparation method of a one-step sintered glass-
ceramic composite board. The preparation method comprises the following steps of A, carrying out 
impact molding on a 
green body; B, 
glazing and printing, namely after 
drying the 
green body obtained in the step A, cleaning the surface of the 
green body, spraying a ground coat, and printing in a way of 
inkjet printing, roller printing, silk 
screen printing or a combination of several selected from all the ways; C, applying glass-
ceramic frits, namely spreading the glass-
ceramic frits on the surface of the green body obtained in the step B, and spraying a layer of 
polyurethane fixing agent, wherein the 
polyurethane fixing agent is prepared from the following components in percentage by 
mass: 6.5-7.5% of nonionic 
polyurethane associative thickener, 3.2-4.4% of white 
carbon black, 1-1.5% of defoaming agent, 0.3-1.3% of dispersing agent and the balance of 
solvent; D, 
sintering, namely 
sintering in a 
kiln at the temperature of 1200-1300 DEG C; and E, 
polishing to obtain a finished product of the glass-
ceramic composite board. By using the method, adverse effects caused by the 
adsorption effect of a preheating zone of the 
kiln to the glass-ceramic frits can be avoided, and the rate of finished products can be increased.