An LED recessed light with transparent board includes a heat sink base, an LED illumination module, a sleeve, a transparent board and a positioning element. The heat sink base has a first surface and a second surface. The LED illumination module is mounted on the first surface of the heat sink base thereof. The sleeve is mounted on the first surface of the heat sink, so as to the LED illumination module is located within the sleeve, and the sleeve is formed with an open end, which has an internal flange. The transparent board is arranged at internal flange of the sleeve for covering the sleeve. And the positioning element is mounted at the sleeve for positioning the transparent board.