The invention provides a control cabinet button mounting assembly, which comprises multiple mounting units. The mounting units are fixedly connected through connection devices; each mounting unit comprises a mounting plate and a button fixing device; two ends of the mounting plate present an L-type structure; the end part of the mounting plate is arranged in fit with the inner wall of a box door of the control cabinet through a bolt; the button fixing device is arranged at one side, far away from the box door, of the mounting plate; the button fixing device comprises a fixing column, the fixing column is provided with an inner threaded hole, the mounting plate is provided with a through hole corresponding to the inner threaded hole, and a button is fixed in the inner threaded hole throughthread. The control cabinet button mounting assembly provided in the invention can fix multiple buttons at the same time, the number of mounting units can be reasonably selected according to the number of buttons, and after the multiple mounting units are fixedly connected, mounting to the inner side of the box door can be carried out through the bolt, and pressure on the box door when the buttonis pressed can be effectively reduced through the mounting plate.