A tool hanger assembly has a frame and a hanger. The frame has a back plate and a bracket. The bracket is mounted securely on the back plate and has a recess formed in the bracket. The hanger is connected securely with the frame and has a base plate, multiple screwing devices and multiple arms. The base plate is mounted securely in the recess. The screwing devices are mounted through the base plate and mounted in the bracket to connect securely the base plate with the bracket. The arms are securely mounted on the base plate to allow wrenches to be hung on. Accordingly, to assemble the hanger having the multiple arms with the frame is quick, reduces manufacturing cost and is convenient.