The invention belongs to the technical field of molds and cores or mandrels for machining cement or clay or building stones, and particularly relates to a mold for machining concrete and particularlydiscloses a device for concrete block production. The device for concrete block production comprises a forming groove. Conveyer belts and a sticking mechanism which is used for stickingplastic films to the conveyer belts and driven by the conveyer belts are arranged in the walls of the forming wall. The upper end of the forming groove is open. A cover plate is installed in the forming groove in asliding manner. The cover plate is provided with a filling hole. A cutting-off mechanism used for cutting off the plastic films is further arranged in the wall of the forming groove. The cutting-off mechanism is driven through movement of the cover plate. One side of the forming groove is provided with an opening used for discharging. A material stopping portion is detachably connected into the opening. The device for concrete block production aims to solve the technical problems that by the adoption of an existing mold, during demoulding, concrete adheres to the wall of the mold and is difficult to separate, and the energy consumption of the discharging manner is large.