The invention discloses a device and a method for measuring porosity distribution of permeable concrete. A bracket shaft is vertically arranged on a base; a height adjusting device is arranged on thebracket shaft; a measuring device is arranged on the height adjusting device; the height adjusting device comprises a vernier scale; the vernier scale is arranged on an upper scale body in a slide fitway; a fine adjustment device is arranged above the vernier scale; a hanging claw is fixed on a side wall of the vernier scale; the measuring device comprises a carrying device, a measuring cylinderand a water accumulating container. In the device, an electronic digital display and the fine adjustment device are adopted, so that the position of a test sample can be controlled accurately; throughmeasurement of the amount of water discharged by a test sample framework with a certain thickness, the overall average porosity of the permeable concrete can be obtained, and the porosity with a certain thickness at any position can be obtained; the porosities are measured in sequence with a certain thickness, so that the porosity distribution of the permeable concrete can be obtained.