A production device for manufacturing a product in the form of a sheet or a block, including: an initial agitator (1), a primary conveyor belt (2) and a mixing agitator (3); each of initial agitators (1) is configured with the primary conveyor belt (2), one or more stones or a stone-like granular material having a selected particle size and a binder are initially mixed in the initial agitator (1) and then an initial mixture is obtained; the mixing agitator (3) includes a rotating container for undertaking a material; the initial mixture is conveyed to the mixing agitator (3) through the primary conveyor belt (2); more than one initial agitator and matched primary conveyor belts thereof are disposed around the mixing agitator (3) at intervals.