A tool cabinet has a housing and a hanging device. The housing has a work surface, at least one drawer and at least one opening. The at least one drawer is defined in the housing. The hanging device has at least one hanger mounted inside the at least one opening. The at least one hanger has two telescopic stands, a hanging plate and a locking device. The telescopic stands are mounted in the at least one opening and face each other. The hanging plate is mounted between the telescopic stands and extends as the telescopic stands extend. The locking device mounted on the telescopic tubes to hold the inner tube in position. When the tool cabinet is used, the hanging device can be extended out to hang and store tools. The tools can be organized and the work surface will not in be cluttered.