An LED strip light for shelf signboards, the shelf comprising at least one laminate which comprises one card board for setting the LED strip light for shelf signboards, said LED strip light for shelf signboards comprising: a strip-shaped lamp chamber and an LED light-emitting module disposed within the strip-shaped lamp chamber, wherein on a cross-section perpendicular to the extending direction of the strip-shaped lamp chamber, the strip-shaped lamp chamber comprises a card board connecting edge for connecting the card board, a non-transparent edge spaced from the card board connecting edge, an upper transparent edge connecting the card board connecting edge and the non-transparent edge, and a lower transparent edge connecting the card board connecting edge and the non-transparent edge and spaced from the upper transparent edge, the upper transparent edge being parallel to the laminate, the length of the card board connecting edge being less than that of the non-transparent edge, wherein the LED light-emitting module is provided on the card board connecting edge and comprises at least one LED chip, and a strip-shaped reflective device arranged in the light emitting direction of the LED chip, wherein on the cross-section perpendicular to the extending direction of the strip-shaped lamp chamber the strip-shaped reflective device comprises a first reflective surface and a second reflective surface and a boundary line between the first reflective surface and the second reflective surface, the first reflective surface reflecting all the light thereon toward the upper light transparent edge, the second reflective surface reflecting all the light thereon toward the lower transparent edge, and the boundary line intersecting the optical axis of the LED chip. a strip-shaped lamp chamber and an LED light-emitting module disposed within the strip-shaped lamp chamber, wherein on a cross-section perpendicular to the extending direction of the strip-shaped lamp chamber, the strip-shaped lamp chamber comprises a card board connecting edge for connecting the card board, a non-transparent edge spaced from the card board connecting edge, an upper transparent edge connecting the card board connecting edge and the non-transparent edge, and a lower transparent edge connecting the card board connecting edge and the non-transparent edge and spaced from the upper transparent edge, the upper transparent edge being parallel to the laminate, the length of the card board connecting edge being less than that of the non-transparent edge, wherein the LED light-emitting module is provided on the card board connecting edge and comprises at least one LED chip, and a strip-shaped reflective device arranged in the light emitting direction of the LED chip, wherein on the cross-section perpendicular to the extending direction of the strip-shaped lamp chamber the strip-shaped reflective device comprises a first reflective surface and a second reflective surface and a boundary line between the first reflective surface and the second reflective surface, the first reflective surface reflecting all the light thereon toward the upper light transparent edge, the second reflective surface reflecting all the light thereon toward the lower transparent edge, and the boundary line intersecting the optical axis of the LED chip. a card board connecting edge for connecting the card board, a non-transparent edge spaced from the card board connecting edge, an upper transparent edge connecting the card board connecting edge and the non-transparent edge, and a lower transparent edge connecting the card board connecting edge and the non-transparent edge and spaced from the upper transparent edge, the upper transparent edge being parallel to the laminate, the length of the card board connecting edge being less than that of the non-transparent edge, wherein the LED light-emitting module is provided on the card board connecting edge and comprises at least one LED chip, and a strip-shaped reflective device arranged in the light emitting direction of the LED chip, wherein on the cross-section perpendicular to the extending direction of the strip-shaped lamp chamber the strip-shaped reflective device comprises a first reflective surface and a second reflective surface and a boundary line between the first reflective surface and the second reflective surface, the first reflective surface reflecting all the light thereon toward the upper light transparent edge, the second reflective surface reflecting all the light thereon toward the lower transparent edge, and the boundary line intersecting the optical axis of the LED chip.