The utility model relates to a ratchet wheel type stepping and overturning driving assembly. The ratchet wheel type stepping and overturning driving assembly is characterized by comprising a material overturning ratchet wheel, a material overturning ratchet wheel arm, a material overturning thorn, a connecting rod and a material overturning air cylinder. The material overturning ratchet wheel is fixedly installed on an overturning shaft. The material overturning ratchet wheel arm is arranged on the outer side of the material overturning ratchet wheel, and is fixedly clamped by a pressure pad. The head end of the material overturning ratchet wheel arm is rotatably installed on the overturning shaft. The tail end of the material overturning ratchet wheel arm is connected with the end of a piston rod of the material overturning air cylinder through the connecting rod. The material overturning thorn is fixed on the inner side of the material overturning ratchet wheel arm through a screw. The head end of the material overturning thorn is pointing towards the material overturning ratchet wheel, and is matched with a ratchet gear groove of the material overturning ratchet wheel. The ratchet wheel type stepping and overturning driving assembly is applicable to a circular shaft automatic material loading device, and has the advantages of being simple in structure and reasonable in design. Accurate and efficient automatic material loading of the circular shaft can be achieved. The ratchet wheel type stepping and overturning driving assembly is beneficial to improving the milling processing efficiency and precision of the circular shaft, lowering the labor intensity and improving the production efficiency.