The present disclosure provides a device, system and method for exterminating rodents in a planar current field, including a first control terminal, a spray tube, an electrode plate and a pyroelectric infrared sensing element; the spray tube is provided with a plurality of The through hole, the spray pipe is communicated with the liquid reservoir through the pipeline, the liquid reservoir is communicated with the gas storage bottle through the solenoid valve, the first control terminal is connected with the solenoid valve, and the pyroelectric infrared sensing element is connected with the first control terminal; the first control terminal is connected with the first control terminal. The control terminal is connected to the electrode plate through the power supply module, the electrode plate includes a positive electrode plate and a negative electrode plate, and the spray range of the spray pipe covers at least the area between the positive electrode plate and the negative electrode plate, and between the positive electrode plate and the negative electrode plate. A planar electric field for shocking mice is formed in the area of the present disclosure; the water film formed after spraying water on the ground of the present disclosure is no different from the natural environment, with strong concealment, and the mice cannot be identified, which improves the rat trapping efficiency; in addition, the rodent control system of the present disclosure The device is placed in a flexible place, and can automatically remove mouse carcasses, realizing continuous mouse capture.