Underpass type highway drainage system

The utility model relates to the technical field of drainage systems, in particular to an underpass type highway drainage system which comprises a third drainage pipe, a third collecting box, a plurality of third water outlet pipes, a second drainage pipe, a first drainage pipe, a plurality of second water outlet pipes, a plurality of groups of side channels, a second communicating pipe, a second collecting box, a plurality of first water outlet pipes, a first communicating pipe and a first collecting box. The first drain pipe, the second drain pipe and the third drain pipe are respectively communicated with the first collecting box, the second collecting box and the third collecting box; the first communicating pipe is communicated with the first collecting box and the second collecting box; the second communicating pipe is communicated with the second collecting box and the third collecting box; each side channel is connected with a first drainage pipe through a plurality of first water outlet pipes; each s