A computer desk assembly includes a desk and a display. The desk defines a receiving groove in a top thereof. The desk includes two sliding plates movably engaging in the receiving groove. The display is in the receiving groove of the desk and pivotably connected to the desk. When the computer desk assembly is in a first state, the sliding plates are disposed above the display. When the computer desk assembly is in a second state, the sliding plates slide laterally to expose the display, whereby the display is rotated up relative to the desk for use.