The invention discloses a disc-type limit mechanism for a filling machine. A limit disc is arranged at the left side of the mechanism; a ratchet wheel is coaxially fixed at the middle of the limit disc; the ratchet wheel is mutually connected with an upper shifting disc at the other end through a lever; a spring is arranged in front of the lever and the upper shifting disc; a lower shifting disc is fixed below the upper shifting disc through a location pin; a rotary shaft is arranged at the centres of the upper shifting disc and the lower shifting disc; the bottom end of the rotary shaft is fixed above a base; a plurality of bottles to be filled are arranged on the edge of the limit disc along a tangential direction; and a bottle push plate capable of freely sliding is arranged in the tangential direction of the right side of the upper shifting disc. The disc-type limit mechanism disclosed by the invention is simple in overall structure, capable of effectively preventing the bottles to be filled from being damaged due to extrusion and blocked, accurately conveying the bottles to be filled into the filling machine, and repeatedly carrying out filling working, and high in practicability.