The invention belongs to the technical field of roadway support, during production practice, a deep soft rock roadway cannot be easily and effectively supported all the time, many unnecessary accidents are caused, and thus, the support method needs to be improved. The invention discloses a deep soft rock round roadway support method. The deep soft rock round roadway support method comprises the following steps that 1, after a round roadway is excavated, the position 45-degree away from the top arch of the roadway serves as the starting point, grouting holes are drilled at 90-degree intervals,and surrounding rock is subjected to grouting at intervals in the radial direction of the roadway; 2, arc-shaped grooves are drilled at the positions of grouting openings, and after an anchor cable isset up, the exposure part of the anchor cable is just parallel to the wall of the roadway; 3, before grout is solidified, the anchor cable is arranged along the positions of the grouting holes, and two movable semicircular buckle devices are installed on the lower surface of an anchor cable tray; 4, a steel pipe concrete bracket is installed, and sleeves of the steel pipe concrete bracket are made to correspond to the semicircular buckle devices; and 5, the semicircular buckle devices and the sleeves of the steel pipe concrete bracket are fixed through bolts. According to the deep soft rock round roadway support method, the support effects of the surrounding rock, the grout, the anchor cable and the steel pipe concrete bracket are sufficiently achieved, the advantages of being good in support performance, safe, reliable, long in service life and the like are realized, and the deep soft rock roadway can be effectively supported.