Abstract: A toolbox has at least one male connector and at least one female connector so that a plurality of toolboxes can be connected by the connection of the male connector and female connector; a bottom of the toolbox having at least one guide groove; a leg frame having at least one hook. Each male connector is a long sheet vertically arranged at the lateral side of the receiving box and each female connector has a hole for receiving the male connector. A wall of the toolbox has a plurality of slots; and the plurality of slots penetrate to a bottom of the receiving box. The leg frame has a lower bar. Each of two ends of the lower bar is extended with a supporter. A distal end of each supporter has a hook; and the hook can be inserted into the guide groove for supporting the receiving box.