Expressway initial runoff rainwater treatment device

The utility model provides an expressway initial runoff rainwater treatment device which is characterized in that a primary treatment chamber, a filler treatment chamber and a plant purification chamber are sequentially arranged in a pool body, a baffle and a filtering device are arranged in the primary treatment chamber, the primary treatment chamber has the functions of filtering and settling, and large-size objects and settleable objects in runoff can be removed; a plurality of filler layers are arranged in the filler treatment chamber and are used for further filtering and adsorbing pollutants in the runoff; plants are planted in the plant purification chamber, deep purification can be conducted on the water body, the content of nitrogen, phosphorus and heavy metal salt in runoff is reduced, and effective treatment of rainwater runoff is achieved. The treatment device disclosed by the utility model is arranged in an integrated manner, so that the occupied area can be reduced while the runoff is effectivel