A simple and environment-friendly production equipment for carbon nano-materials includes a power source and an AC/DC rectifier. A vacuum device for producing the carbon nano-materials is connected with two output ends of the AC/DC rectifier. An alternate current is generated by the power source and then is rectified into a direct-current power supply through the AC/DC rectifier to provide a power supply for a first graphite rod and a second graphite rod in the same direction, so as to generate a high-voltage electric arc at a junction of the first graphite rod and the second graphite rod, and plasma ionization is conducted on substances on the two graphite rods through the high-voltage electric arc, so that carbon atoms in the two graphite rods are decomposed, and carbon nano-materials are separated out and collected into a collector through a cover.