Provided is a method for continuously producing a dispersion liquid containing a pest controlling composition. This method includes steps of: dispersing a suspension and a dispersion medium in a first dispersion tank by stirring the suspension and the dispersion medium in the first dispersion tank while continuously supplying the suspension and the dispersion medium into the first dispersion tank, the suspension being formed by suspending a solid pest controlling composition in a water-immiscible organic solvent and the dispersion medium being formed from water or a water solvent containing an alcohol and stirring a first dispersion liquid in a second dispersion tank while continuously supplying into the second dispersion tank the first dispersion liquid discharged continuously from the first dispersion tank, wherein the stirring of the first dispersion liquid is continued until a dispersion state of the first dispersion liquid becomes stable.
