Magnetic disc unit box

The utility model relates to a late-model containing box for a magnetic disc machine. An upper cover and a lower cover are combined, which forms a body. The utility model is characterized in that the lateral edge of the upper cover along a long direction is provided with a sliding groove; the lateral edge of the lower cover along a long direction is provided with a guiding rail; the back end of the upper cover is provided with one opening whose both lateral edges are respectively provided with a sliding rail; a fixed sheet provided with a contact spring sheet is embedded along the opening; the back end of the lower cover is provided with the other opening which is symmetrical to the opening of the upper cover from top to bottom; a fixed sheet clamped with a conducting sheet can be embedded in the opening. When a plurality of bodies are mutually sheathed, the spring sheets and the conducting sheets of the upper fixed sheets and the lower fixed sheets can mutually be contacted, and a circuit is conducted.