The invention relates to an auxiliary cabinet mounting rack and is convenient for mounting the scheduling data network onsite equipment. The rack comprises side rods, connection rods and supporting assemblies, wherein the two pairs of supporting assemblies are arranged between the two side rods, the supporting assemblies are respectively arranged on the corresponding side rods in pairs, the supporting assemblies mainly comprise lower supporting rods, upper supporting rods and swinging rods, mounting ends of the lower supporting rods are fixed on the side rods, upper portions of the lower supporting rods are provided with the upper supporting rods, mounting ends of the upper supporting rods are in sliding connection with the side rods, latching bolts are arranged between the mounting ends of the upper supporting rods and the side rods, the two swinging rods which are in hinge connection to form an X structure are arranged between the upper supporting rods and the lower supporting rods, an upper end of the first swinging rod is in hinge connection with the upper supporting rods, a lower end of the first swinging rod is sliding connection with the lower supporting rods, an upper end of the second swinging rod is in sliding connection with the upper supporting rods, and a lower end of the second swinging rod is in hinge connection with the lower supporting rods. Through the rack, mounting of switches in different dimensions and a router can be conveniently realized.