A modularized electronic switching controller assembly for a computer includes a computer device; a hub positioned at a rear end of the computer device; two sides of the hub unit being installed with tracks which are retained in a machine frame; the machine frame being formed by four supporting posts; a support arm connected between the computer-related assembly and the hub for receiving conductive wires; a switching controller installed at the tracks having two racks of the hub unit; a connecting surface of the switching controller having an electric connector; a rear side of the switching controller being installed with at least one connecting port; moving the switching controller through the tracks will make the switching controller entering from a rear end of the machine case; by the connection of the electric connector and the hub unit, the connecting port can be connected to external peripherals or a server.