The invention relates to a cable fixing device, in particular to an adjustable cable support. The adjustable cable support solves the technical problem that the height and the direction of an existing cable support cannot be adjusted flexibly. The adjustable cable support comprises a vertical support body. The vertical support body is sleeved with a plurality of sleeves from top to bottom. The lower end opening of each sleeve is provided with a plurality of open grooves which are arranged around the center of the sleeve at equal intervals. Pin sets corresponding to all the sleeves respectively are arranged on the outer surface of the vertical support body and are used for locating the sleeves. Each pin set comprises a plurality of pins, wherein the number of the pins is identical to that of the open grooves of the corresponding sleeve, and the pins surround the outer surface of the vertical support body at equal intervals. Each sleeve is arranged on the corresponding pin set through the open grooves. The outer surface of each sleeve is fixedly provided with a cable support. According to the adjustable cable support, the structure is simple, adjustment of the height and the angle of the cable support is achieved just by simple structural combination, use is convenient, cost is low and production and manufacturing are quite simple.