The invention discloses a multifunctional tool box. The multifunctional tool box comprises a shell and a box frame movably mounted in the shell; two sliding grooves are formed in the inner wall of thebottom end of the shell, the two sliding grooves are located in the two sides of the bottom end of the shell, two sliding blocks are fixedly mounted on the bottom end of the box frame, the two sliding blocks are matched with the two sliding grooves, a box body is of a cuboid structure, the box frame comprises four supporting frames, a mounting plate and a bottom plate, the four supporting framesare fixedly welded to the periphery of the bottom plate, each supporting frame comprises a first support and a second support, one ends of the four first supports are fixedly welded to one ends of hinges, the other ends of the four hinges are fixedly welded to the second supports, and the four first supports and the four second supports are free of contact. Various sizes of tools can be conveniently stored, the tool box can serve as a stool to be used by a user, needs of the user are met, the structure is simple, and use is convenient.