An optical element package includes an optical wave guide array, at least one optical assembly and at least one optical transmission member. The optical wave guide array has a reflection groove. The reflection groove includes a reflection surface. The at least one optical assembly is positioned on the optical wave guide array adjacent to the reflection surface. The at least one optical transmission member is positioned on the optical wave guide array, and is optically coupled with the reflection surface. The optical signals emitted by the at least one optical assembly are reflected by the reflection surface and then reaching the at least one optical transmission member for transmission.