The invention discloses an auxiliary opposite bracing mechanism for upright rod construction, which can brace two parallel wires and has the advantages of simple structure, convenient operation and reliable connection. The auxiliary opposite bracing mechanism for upright rod construction comprises a main rod sleeve, a movable rod sleeve and a plunger limiting mechanism, wherein the movable rod sleeve is inserted in the main rod sleeve and can axially side along the main rod sleeve; and the plunger limiting mechanism comprises a radial through hole arranged in the main rod sleeve, a pin rod arranged in the radial through hole in a sliding mode, a first annular clamping groove and a second annular clamping groove arranged on the outer side surface of the movable rod sleeve for being matchedwith the pin rod, a pulling rod arranged on the end surface of the pin rod, and a pin rod reset spring sleeving the pulling rod.