The invention provides a switch operation over-voltage inhibition method for an impedance low-voltage ride through detection device. The method comprises: step 1, a resistance-capacitance absorption characteristic of an over voltage of a switch in a low-voltage ride through detection device is analyzed; step 2, an over voltage up that is generated when the switch is turned off is calculated; step three, a resistance-capacitance over-voltage inhibition loop is constructed; and step four, the resistance-capacitance over-voltage inhibition loop is connected ot the low-voltage ride through detection device. Compared with the prior art, the method has the following beneficial effects: parameters of the resistance-capacitance over-voltage inhibition loop are determined by combining line parameters of the low-voltage ride through detection device; the resistance-capacitance over-voltage inhibition loop is added to an electrical node needing over-voltage inhibition; and thus the over-voltage amplitude and frequency that are caused by current cutting off during the switch breaking process can be suppressed in a security range.