A strip light used in showcase, comprising: strip light holder, disposed opposite to the illumination surface; circuit board, disposed on the strip light holder, provided with a light source mounting surface toward the illumination surface; at least three light sources, disposed spaced along the length direction of the strip light holder on the light source mounting surface, and optical axis of the light source are perpendicular to the circuit board; at least three optical components, respectively disposed corresponding to each of the light sources; wherein the optical components comprise: first light splitting member, provided with at least two groups, at least one of which is provided in each group, and including two first light splitting surfaces distributed on two sides of the optical axis of the light source; the first light splitting surface directs light of the light source at the optical axis and its vicinity outward along the width direction of the strip light holder and projects the light to the distal end of the illumination surface; light stretching member, provided with at least one group, at least one of which is provided in each group, each group being located between two adjacent groups of first light splitting members, and used for diffusing the light of the light source along the length direction of the strip light holder and projecting it onto the illumination surface directly in front of the first light splitting member of the adjacent group, characterized in that the first light splitting member adopts light splitting lens, the first light splitting member includes a first light splitting surface, which is total reflection surface; the first light splitting member further includes a first light incident surface disposed in a light emitting direction of the light source and a first light emitting surface distributed on two sides of the optical axis of the light source; the first light splitting surface is located above the first light incident surface along the light emitting direction of the light source, and the first light emitting surface is located outside of the first light splitting surface in the same side. strip light holder, disposed opposite to the illumination surface; circuit board, disposed on the strip light holder, provided with a light source mounting surface toward the illumination surface; at least three light sources, disposed spaced along the length direction of the strip light holder on the light source mounting surface, and optical axis of the light source are perpendicular to the circuit board; at least three optical components, respectively disposed corresponding to each of the light sources; first light splitting member, provided with at least two groups, at least one of which is provided in each group, and including two first light splitting surfaces distributed on two sides of the optical axis of the light source; the first light splitting surface directs light of the light source at the optical axis and its vicinity outward along the width direction of the strip light holder and projects the light to the distal end of the illumination surface; light stretching member, provided with at least one group, at least one of which is provided in each group, each group being located between two adjacent groups of first light splitting members, and used for diffusing the light of the light source along the length direction of the strip light holder and projecting it onto the illumination surface directly in front of the first light splitting member of the adjacent group,