The invention discloses a production technique of a simulated grey brick. The simulated grey brick is composed of an upper layer and a lower layer, wherein the lower layer is prepared by mixing and pressing cement, sand, black powder and water; and the upper layer is prepared by mixing and pressing cement, sand, rock powder and water. The production technique comprises the following steps: filling a mixture of cement, sand, black powder and water into a mold, and forming the lower layer of the simulated grey brick in a layer-by-layer wet pressing mode in batches; filling a mixture of cement, sand, rock powder and water into the lower layer, and forming the upper layer of the simulated grey brick in a layer-by-layer wet pressing mode in batches; demolding, and curing in a steam drying chamber for 24 hours; and finally, naturally curing in a place. The technique uses local materials, and utilizes the rock powder instead of the black powder, thereby better utilizing the waste materials, lowering the production cost, reducing the damage to the environment, and enhancing the competitive power of the product.