Filling machine disinfectant supplement control method and device and filling machine

The invention provides a filling machine disinfectant supplement control method and device and a filling machine. The method comprises the following steps: acquiring a target concentration value and a target capacity of a disinfectant in the filling machine; monitoring a disinfectant supplementing signal sent by the filling machine, and obtaining a current concentration value of the filling machine corresponding to the current disinfectant supplementing signal moment, a previous concentration value corresponding to the previous disinfectant supplementing signal moment and a previous disinfectant supplementing amount; calculating the current to-be-supplemented amount of the disinfectant based on the target concentration value, the current concentration value and the target capacity; correcting the current to-be-supplemented amount based on the target concentration value, the previous concentration value and the previous disinfectant supplementing amount, and determining a target supplementing amount; and contr