Abstract: A tool storage rack is adapted for retaining a plurality of tool heads therein, and includes a positioning seat and a base seat coupled to the positioning seat. The positioning seat has a top wall, a surrounding wall extending downwardly from the top wall, and a plurality of spaced apart positioning holes formed in the top wall. The base seat has a base wall connected to the surrounding wall, and a plurality of positioning units formed on the base wall at positions corresponding respectively to the positioning holes. Each of the positioning units includes a pair of spaced apart positioning plates that extend upwardly from the base wall, and a pair of protrusions formed respectively at the positioning plates and adapted to abut against an internal wall surface of a tool head when the latter is sleeved on the positioning unit via a corresponding one of the positioning holes.