The invention relates to a liquid mid-set limited emission control device which comprises a liquid storage tank, wherein the liquid storage tank is connected with a dosing tank; a communicating port is arranged between the liquid storage tank and the dosing tank; a first control valve is installed in the communicating port; the lower part of the dosing tank is provided with a discharge port; a second control valve is arranged in the discharge port; when the second control valve is closed, the first control valve is opened, the liquid storage tank communicates with the dosing tank, and the liquid in the liquid storage tank flows into the dosing tank; and when the second control valve is opened, the first control valve is closed, and the liquid in the dosing tank is discharged in the discharge port. A toilet cleaner, such as a toilet cleaner bottle or toilet cleaner container, or a tap water pipe is arranged in the liquid storage tank, the liquid storage tank communicates with the dosing tank, the volume of the dosing tank is determined according to the properties of the liquid and the consumption requirement each time, the liquid in the dosing tank is designed according to the consumption requirement, and thus, the emitted liquid can achieve the use effect without waste; and by adopting the valve control, the liquid mid-set limited emission control device has the advantages of high reliability and long service life.