The invention provides an overhead transmission line wireless monitor and a two-location wireless monitor system and belongs to the field of electric engineering. The overhead transmission line wireless monitor includes a machine body, a clamping base, a supporting slide rail mechanism, and a movable wireless monitor mechanism. The machine body and the clamping base are respectively installed detachably on a pole tower; the supporting slide rail mechanism includes a telescopic slide rail, which includes a fixed end and an extending end, wherein the fixed end is fixed to the machine body and the extending end is clamped on the clamping base; the movable wireless monitor mechanism includes a camera and is slidingly arranged on the telescopic slide rail. The two-location wireless monitor system comprises a first vertical column and a second vertical column, which are mounted on ground, and the overhead transmission line wireless monitor. The overhead transmission line wireless monitor can be used for monitoring an electric transmission line, a pole tower, metal fittings and surrounding environment of an overhead transmission line. The two-location wireless monitor system is used for monitoring an environment, in certain range, between two locations.