A high power light emitting diode lighting device, comprising: a case; a substrate disposed on an inner surface of the case and including a plurality of LED chips mounted and spaced apart by a predetermined distance from each other in a row direction, a column direction, or both on the substrate; and a reflection module connected to the substrate and including a plurality of light reflection semi-spheres to reflect light emitted from the LED chips to achieve a predetermined light distribution, further comprising: a supporting frame configured to support a lighting unit; and an electric power supplying unit supported by the supporting frame to be spaced apart from the lighting unit; an angle adjustment unit including at least one hinge (450, 460), an end of the angle adjustment unit being connected to the lighting unit and another end thereof being connected to the electric power supplying unit, wherein an angle of the lighting unit is adjusted by action of the at least one hinge (450, 460), characterized in that the angle adjustment unit includes: a screw having a first end coupled to the lighting unit; a receiving part having a first end coupled to the electric power supplying unit and a second end configured to receive the screw; and a rotation controller mounted on the second end of the receiving part to adjust an insertion and a withdrawal of the screw into and out of the receiving part while rotating in an idle state, wherein the first end of the screw is coupled to the lighting unit by at least one hinge (450, 460), the first end of the receiving part is coupled to the electric power supplying unit by at least one hinge (450, 460), or both. a case; a substrate disposed on an inner surface of the case and including a plurality of LED chips mounted and spaced apart by a predetermined distance from each other in a row direction, a column direction, or both on the substrate; and a reflection module connected to the substrate and including a plurality of light reflection semi-spheres to reflect light emitted from the LED chips to achieve a predetermined light distribution, further comprising: a supporting frame configured to support a lighting unit; and an electric power supplying unit supported by the supporting frame to be spaced apart from the lighting unit; a supporting frame configured to support a lighting unit; and an electric power supplying unit supported by the supporting frame to be spaced apart from the lighting unit; an angle adjustment unit including at least one hinge (450, 460), an end of the angle adjustment unit being connected to the lighting unit and another end thereof being connected to the electric power supplying unit, wherein an angle of the lighting unit is adjusted by action of the at least one hinge (450, 460), characterized in that the angle adjustment unit includes: a screw having a first end coupled to the lighting unit; a receiving part having a first end coupled to the electric power supplying unit and a second end configured to receive the screw; and a rotation controller mounted on the second end of the receiving part to adjust an insertion and a withdrawal of the screw into and out of the receiving part while rotating in an idle state, a screw having a first end coupled to the lighting unit; a receiving part having a first end coupled to the electric power supplying unit and a second end configured to receive the screw; and a rotation controller mounted on the second end of the receiving part to adjust an insertion and a withdrawal of the screw into and out of the receiving part while rotating in an idle state, wherein the first end of the screw is coupled to the lighting unit by at least one hinge (450, 460), the first end of the receiving part is coupled to the electric power supplying unit by at least one hinge (450, 460), or both.