A combination classification shelf includes a base frame and at least one shelf divider. The base frame includes two support rod members transversely arranged in parallel. The shelf divider is detachably mounted at the base frame. The shelf divider is bent to from two classification rod members and two transverse rod members. Each classification rod member has two hooked end portions. The transverse rod members are respectively connected between the classification rod members and define with the hooked end portions of the respective classification rod members a respective receiving space. The support rod members are respectively positioned in the respective receiving spaces. The transverse rod members are respectively supporting the support rod members. Thus, the shelf dividers will be not fall easily.