Device and method for detecting water permeability of permeable asphalt concrete

The invention relates to a device and a method for detecting the water permeability of permeable asphalt concrete. The device comprises a water supply pool, a pressure regulating bin, a spray header, a test bin, an asphalt test plate, a movable water tank and a PLC (Programmable Logic Controller). The asphalt test plate is arranged in the testing bin in a variable inclination mode, water is conveyed to the pressure adjusting bin through the water supply pool, and the pressure in the pressure adjusting bin is adjusted to the target value after the pressure adjusting bin has enough water; the water yield of the spray header is controlled, and the asphalt test plate is sprayed through the spray header; a water escape valve is opened after spraying is finished, the water escape valve is closed after water release is finished, the water seepage amount of the asphalt test plate is read through the weighing movable water tank, and the water permeability of the asphalt test plate is obtained through calculation; the