The invention discloses a novel elevator car platform sill. The inner wall of a car platform sill body is provided with an interaction panel and an installing groove. A pedal assembly is installed in the installing groove. The pedal assembly comprises a fixing shaft, a moving sleeve arranged coaxially with the fixing shaft, and a second moving rod. The fixing shaft is fixedly connected into the installing groove through a connecting assembly. The moving sleeve is connected with a pedal frame with skeletons. One end of the second moving rod penetrates the opening end of the fixing shaft. The side wall of the fixing shaft is provided with a plurality of opening assemblies. The outer wall of the second moving rod is provided with a plurality of connecting column assemblies. The drive mode of an alarm button is changed and is obviously different from the trigger mode of a door opening button, a switch button and a floor button, and in this way, accidental touch of passengers to the alarm button can be reduced greatly. In addition, by adjusting the angle position of the moving sleeve relative to the fixing shaft, the height position of the pedal frame relative to the interaction panel can be adjusted, and meanwhile, the above-mentioned height position can be fixed.