The invention provides a miniature development machine. The miniature development machine comprises a front shield and a rear shield, the front shield is internally provided with a baffle, the front shield is provided with a front shield support device, a propulsion device is arranged between the front shield and the rear shield, the rear shield is provided with a rear shield support device, and main drive for driving a knife disc is arranged at the center of the baffle. The miniature development machine has the advantages that the development machine diameter is small and typically less thanphi 1.5 m; the miniature development machine is suitable for hard rock tunnel excavation, no pressure is established on the excavation face, muck is discharged directly out of a hole, integrate forming can be realized, the construction speed is high, and the construction efficiency is high; the miniature development machine is suitable for tunnel excavation of a down-traversing city cement floor and a down-traversing existing tunnel, and traffic construction does not affected; compared with a traditional mud and water development machine, independent separation equipment is not required, a muck discharging system occupies a small area, the tunnel construction cost is low, and high-efficiency muck discharging of the miniature tunnel development machine is realized; and the muck dischargingsystem is simple and compact in structure, can be selected according to specific geology and the construction environment, and rapid discharging of muck is advantageously convenient.