An LED lighting apparatus having LED arrays turned on or off independently, comprising: an LED module including a PCB, and LEDs mounted on the PCB, the LEDs divided into a plurality of LED arrays (11A, 11B, 11C) that are independently turned on or off; a heat dissipation unit, with the LED module mounted on a front of the heat dissipation unit; and a locking bracket on which the heat dissipation unit is mounted, the LED lighting apparatus further comprising angle adjusting means, the angle adjusting means comprising: a first hinge hole formed in a vertical part of the locking bracket; a guide hole formed in the vertical part to have a shape of an arc around the first hinge hole; a second hinge hole formed in a side surface of the heat dissipation unit to correspond to the first hinge hole; a locking hole formed in the side surface of the heat dissipation unit to correspond to the guide hole; a hinge pin inserted into the first hinge hole and the second hinge hole to hingedly couple the locking bracket to the heat dissipation unit; a locking pin passing through the guide hole to be fastened to the locking hole, guiding rotation of the heat dissipation unit, and locking the heat dissipation unit to the locking bracket; an additional bolt insert hole formed in the vertical part at a location between the first hinge hole and the guide hole; an additional locking hole formed in the side surface of the heat dissipation unit to correspond to the additional bolt insert hole; and an additional fastening bolt passing through the additional bolt insert hole and fastened to the additional locking hole. an LED module including a PCB, and LEDs mounted on the PCB, the LEDs divided into a plurality of LED arrays (11A, 11B, 11C) that are independently turned on or off; a heat dissipation unit, with the LED module mounted on a front of the heat dissipation unit; and a locking bracket on which the heat dissipation unit is mounted, the LED lighting apparatus further comprising angle adjusting means, the angle adjusting means comprising: a first hinge hole formed in a vertical part of the locking bracket; a guide hole formed in the vertical part to have a shape of an arc around the first hinge hole; a second hinge hole formed in a side surface of the heat dissipation unit to correspond to the first hinge hole; a locking hole formed in the side surface of the heat dissipation unit to correspond to the guide hole; a hinge pin inserted into the first hinge hole and the second hinge hole to hingedly couple the locking bracket to the heat dissipation unit; a locking pin passing through the guide hole to be fastened to the locking hole, guiding rotation of the heat dissipation unit, and locking the heat dissipation unit to the locking bracket; an additional bolt insert hole formed in the vertical part at a location between the first hinge hole and the guide hole; an additional locking hole formed in the side surface of the heat dissipation unit to correspond to the additional bolt insert hole; and an additional fastening bolt passing through the additional bolt insert hole and fastened to the additional locking hole. a first hinge hole formed in a vertical part of the locking bracket; a guide hole formed in the vertical part to have a shape of an arc around the first hinge hole; a second hinge hole formed in a side surface of the heat dissipation unit to correspond to the first hinge hole; a locking hole formed in the side surface of the heat dissipation unit to correspond to the guide hole; a hinge pin inserted into the first hinge hole and the second hinge hole to hingedly couple the locking bracket to the heat dissipation unit; a locking pin passing through the guide hole to be fastened to the locking hole, guiding rotation of the heat dissipation unit, and locking the heat dissipation unit to the locking bracket; an additional bolt insert hole formed in the vertical part at a location between the first hinge hole and the guide hole; an additional locking hole formed in the side surface of the heat dissipation unit to correspond to the additional bolt insert hole; and an additional fastening bolt passing through the additional bolt insert hole and fastened to the additional locking hole.