The invention relates to brick-type control glaze for improving production of a dark-color ceramic product, glaze powder and a preparation method. The control glaze is prepared from the following mineral components: zirconium silicate, potassium feldspar, albite, calcinedtalc, superfine quartz powder, kaolin and the glaze powder. The preparation method comprises the following steps: (1) accordingto a glaze formula by weight percent, after distributing and weighing, adding 0.20-0.40% of sodium carboxymethylcellulose, and 0.30-0.50% of sodium tripolyphosphate, and mixing; and (2) enabling the mixed raw material to be mixed with ballstone and water according to a proportion that the raw material to the ballstone to the water is 1 to 1.2 to 0.43, and adding into a ball mill for ball-milling,to obtain the glaze slurry, wherein a fineness of glaze slurry is controlled to be 325 meshes of a standard sieve, a residue on sieve is 0.3-0.5%, a glaze slurry specific gravity is 1.76-1.82, and flowing time measured by a viscometer is 30-60 seconds, deironing and sieving the glaze slurry, after performing obsolescence for 48-72 hours, for standby use.