The invention relates to a monitoring method of a relay protection outlet pressing plate. The monitoring method comprises the following steps: obtaining input voltage signals of lower end connecting columns of a protection tripping outlet pressing plate and a reclosing gate outlet pressing plate; when the input voltage signals reflect that the protection tripping outlet pressing plate and the reclosing gate outlet pressing plate are input, outputting input state information; when the input voltage signals reflect that the protection tripping outlet pressing plate and the reclosing gate outlet pressing plate are not input or are virtually connected, not outputting the input voltage signals; monitoring an input state of the relay protection outlet pressing plate through the input state information. According to the monitoring method provided by the invention, a cascaded triode is combined with an optical coupler relay; missed input and virtual connection can be judged at the same time through the same voltage conversion circuit; input conditions of the protection device tripping outlet pressing plate and the reclosing gate outlet pressing plate can be judged and whether the pressing plate is virtually connected or not can also be judged; the problem that a judgment method of voltage difference cannot eliminate exceptional cases when two ends of the reclosing gate outlet pressing plate have positive charge at the same time is solved.