The invention discloses a communication machine cabinet bottom part plugging plate, belongs to the field of communication equipment and is used for plugging of the bottom part of a communication machine cabinet and aperture reserving of cables and other lines. In order to achieve the aforementioned objective, the communication machine cabinet bottom part plugging plate comprises a plate body of the following technical scheme. The plate body is provided with heat-radiating holes and aperture adjusting plates. One side of the plate body is provided with a side plate. The aperture adjusting plates are connected with the plate body and the adjacent aperture adjusting plates via transverse supporting bones and vertical supporting bones. According to the technical scheme, plugging of the bottom part of the machine cabinet can be realized, and the communication machine cabinet bottom part plugging plate can be suitable for different apertures of cables and communication line access communication machine cabinets without waste of the plugging plate caused by oversize or undersize of the preserved aperture.