The invention relates to a manufacturing method of an anti-cracking decorative plate. The method comprises the steps of: (1) adhering double sticky tapes on both sides of a whole aluminum-plastic panel, and adhering a whole fire-proof plate on both sides of the aluminum-plastic panel respectively to form a composite plate; (2) applying a pressure on the fire-proof plate to be better bonded with the aluminum-plastic panel, so that the composite plate is firmly bonded; and (3) cutting the composite plate into pieces according to a demanded size. The fire-proof plate provided by the invention is free from cracking, and after the aluminum-plastic panel and the fire-proof plate are bonded, the aluminum-plastic panel and the fire-proof plate are neat and uniform. A gap at a splicing part between the two composite plates is small. The splicing part can be free from treatment in a later period, so that time is saved and a more attractive appearance is obtained.