The invention relates to the field of electrical switches, in particular to a three-position switch component and an in-place confirmation mechanism thereof. The in-place confirmation mechanism includes a side plate and a cam structure which is rotationally arranged on the side plate and used for being in synchronous transmission connection with a three-position switch. The cam structure has a convex part corresponding to a non-working position of the three-position switch and a concave part corresponding to a working position of the three-position switch. The in-place confirmation mechanism further includes an in-place confirmation rod which is in pushing fit with the convex part when the three-position switch is in the non-working position. The in-place confirmation rod is provided with an in-place stop structure which is used for being in stop fit with the concave part to limit the rotation of the cam structure when the three-position switch is in the working position, and/or being in stop fit with an operation shaft to limit the rotation of the operation shaft when the three-position switch is in the working position. The in-place confirmation mechanism can realize precise positioning of the working position of the three-position switch.