An LED bar lighting device with uniform illumination, comprising: at least two LED chips which are arranged in a row, each of at least two LED chips comprising an optical axis; a bar lens mounted in the light emitting direction of the LED chips , the bar lens comprising an in-light surface profile line and an out-light surface profile line in a cross section perpendicular to the axial direction of the bar lens , the in-light surface profile line having an axis of symmetry of the optical axis of the LED chips and comprising a first arc and two second arcs arranged on two sides of the first arc, the first arc being tangent to the second arc and the radius of the first arc being smaller than that of the second arc, the out-light surface profile line having an axis of symmetry of the optical axis of the LED chips , the radius of the out-light surface profile line being gradually reduced toward two sides thereof from an intersection of the out-light surface profile line and the optical axis, the radius of the out-light surface profile line at the intersection of the out-light profile line and the optical axis being infinite, the refraction angle at both end points of the out-light surface profile line being 0 degree, wherein the bar lens comprises two mounting portions , the two mounting portions are disposed on the two end points of the out-light surface profile line at the cross section perpendicular to the axial direction of the bar lens ; and a circuit board configured for disposing the LED chips , characterized in that the inner walls of the two mounting portions are provided with a platform for inserting the circuit board so that the circuit board is interposed between the two mounting portions . at least two LED chips which are arranged in a row, each of at least two LED chips comprising an optical axis; a bar lens mounted in the light emitting direction of the LED chips , the bar lens comprising an in-light surface profile line and an out-light surface profile line in a cross section perpendicular to the axial direction of the bar lens , the in-light surface profile line having an axis of symmetry of the optical axis of the LED chips and comprising a first arc and two second arcs arranged on two sides of the first arc, the first arc being tangent to the second arc and the radius of the first arc being smaller than that of the second arc, the out-light surface profile line having an axis of symmetry of the optical axis of the LED chips , the radius of the out-light surface profile line being gradually reduced toward two sides thereof from an intersection of the out-light surface profile line and the optical axis, the radius of the out-light surface profile line at the intersection of the out-light profile line and the optical axis being infinite, the refraction angle at both end points of the out-light surface profile line being 0 degree, wherein the bar lens comprises two mounting portions , the two mounting portions are disposed on the two end points of the out-light surface profile line at the cross section perpendicular to the axial direction of the bar lens ; and a circuit board configured for disposing the LED chips , characterized in that the inner walls of the two mounting portions are provided with a platform for inserting the circuit board so that the circuit board is interposed between the two mounting portions . <EOS>