The invention discloses a leavened cake production device and a preparation method thereof. The leavened cake production device comprises a conveying belt conveying mechanism, baffles, a connecting plate, a dough rolling roller, a forming grid plate, a first mounting plate, a supporting frame, a mesh belt conveying mechanism, a baking cover, a baking device, a processing table, supporting legs anda control switch. The two baffles are located at the top of a conveying belt, arranged side by side in the longitudinal direction and connected with the connecting plate. The connecting plate is arranged on the processing table; a driving mechanism for driving the dough rolling roller to rotate is arranged on the processing table; the forming grid plate is arranged at the bottom of the first mounting plate; the supporting frame is arranged on the processing table, and an electric push rod used for driving the first mounting plate to move in the vertical direction is arranged on the supportingframe; the baking cover is arranged on the processing table; the baking device is arranged on the baking cover; the control switch is in respective control connection with the conveying belt conveying mechanism, the mesh belt conveying mechanism, the driving mechanism, the electric push rod and the baking device. According to the invention, automatic production can be achieved, and the leavened cake production efficiency is improved.