The invention discloses a lateral limiting device for a building construction platform. The lateral limiting device for the building construction platform comprises a U-shaped lateral resisting beam, lateral resisting beam fixing pieces used for being connected with external fixtures are arranged on the two side walls of the U-shaped lateral resisting beam, at least on lead screw jack is fixedly installed at the bottom of a slot of the U-shaped lateral resisting beam, a rubber anti-vibration pad is fixedly installed on each lead screw jack, a mirror surface stainless steel plate is arranged at the end of each rubber anti-vibration pad, and under the action of the lead screw jacks, the mirror surface stainless steel plates make contact with a component needing lateral resistance so as to limit lateral displacement of the component. According to the lateral limiting device for the building construction platform, it can be guaranteed that the building construction platform is lifted conveniently and rapidly, and operation is conducted safely and stably.