Expressway reconstruction and extension project construction period road surface drainage system

The invention discloses an expressway reconstruction and extension project construction period road surface drainage system. The road surface drainage system includes: torrent grooves which are formedin a side slope of an old road; drainage channels which are fixedly arranged in a bottom basic layer of a newly expanded road, wherein each drainage channel includes a water inlet end fixedly connected to a tail end of the corresponding torrent groove, and a water outlet end opposite to the water inlet, a plurality of drainage channels are arranged, and the plurality of drainage channels are arranged in parallel; communication pipes arranged between every two adjacent drainage channels and for communicating with every two adjacent drainage channels; a water collection tank which includes a cleaning device and a water storage box, and is used for collecting water on the road surface, cleaning the water, and reusing the water; and a temporary drainage groove having a cross section of a U-shaped structure, wherein t