The utility model relates to a portable multifunctional device box, which comprises a box body and a box cover, wherein the box cover is installed on the box body, one side of the upper surface of the box cover is hinged with a connecting rod mechanism, the other end of the connecting rod mechanism is hinged with a supporting plate, and the left side and the right side of the lower bottom surface of the supporting plate are hinged with two foldable supporting legs respectively. The portable multifunctional device box is ingenious in design, simple in structure, light in weight, beautiful and practical. The device box can form a chair when being opened. In addition, a screen can be placed on the device box so as to be convenient for a tester sitting on the chair to observe the device screen, thereby solving a problem that the tester squats in front of a device for a long time to record data, being capable of improving working conditions, improving the work efficiency, and not requiring to increase the number of devices carried when going out.