The invention discloses a computer hardware fixing device. The fixing device includes a box-type fixing device and a display hardware fixing frame; a slide rail is arranged in the box-type fixing device; the lower part of the display hardware fixing frame is provided with an elevating device; the lower part of the elevating device is provided with a front-back moving device; the lower part of thefront-back moving device is provided with a left-right moving device; and the angles of the elevating device are adjustable. The fixing device is strong in flexibility; the fixing device can be adjusted according to the specific sizes of computer hardware and fixedly adjusted according to the watching positions and angles of users, so that the fixing device can be better in adjusting effect; and the fixing device has a heat dissipation function, so that heat dissipation and cooling on the computer hardware can be realized, and the enhancement of the service life of the computer hardware and effects of using performance can be achieved.