A computer enclosure includes a computer case and a power supply tray. The computer case includes a side plate and a rear plate adjacent to the side plate. A clamping portion is located on the rear plate, and an opening is defined between the side plate and the rear plate. The power supply tray is attached to the opening and includes a clipping member. The clipping member includes a securing portion extending from the power supply tray and a clipping portion rotatably attached to the securing portion. The clipping portion is engaged with the clamping portion to secure the power supply tray to the computer case, and the clipping portion is rotatable relative to the rear plate to disengage the clipping portion from the clamping portion.